Why do species die out? This is the overarching question being asked by many leading researchers. Knowing more about what leads to a species’ becoming extinct could enable us to do something about it. The passenger pigeon is a famous example and the species has been studied extensively.
The passenger pigeon (Ectopistes migratorius) was once found in huge numbers in North America. Records tell of passing flocks that darkened the skies for several days at a time. The species may have peaked at five billion individuals. A more conservative estimate is three billion.
Within a short time, the species disappeared completely.
“Given the huge size of the population, it’s simply amazing that the species disappeared so quickly,” says Tom Gilbert.
Gilbert is a professor at the University of Copenhagen’s Centre for GeoGenetics, but he also has a part-time position as an adjunct professor at the Norwegian University of Science and Technology (NTNU).
The human role
The history of the passenger pigeon is interesting, partly because it can tell us something about how and why species become extinct.
Native Americans also relied on passenger pigeons for food. But at least in parts of the passenger pigeons’ range, people had learned to harvest the species at a sustainable level that didn’t threaten to eradicate it.
It was common in some parts of North America to only eat young pigeons that were hunted at night, since this did not seem to scare away the adult birds or prevent them from re-nesting.
But starting around 1500, a more aggressive variant of humans came to the continent with the arrival of Europeans. The hunt for passenger pigeons grew and culminated in a massive hunt for the species throughout the 1800s, before the species finally collapsed and disappeared.
So were the Europeans then really the ones to blame for the collapse?
Already headed to oblivion?
In 2014, a study in published in the scientific journal PNAS strongly suggested that humans were simply the final straw in destroying a species that was already vulnerable and headed to oblivion.
The researchers asserted that despite their enormous numbers, the passenger pigeons were already in trouble. The population of the species varied greatly, similar to lemmings, but over a longer period of time.
When the Europeans arrived, the species was already in a strong decline. The population was plummeting long before Europeans arrived, and perhaps Europeans even contributed to a short-term increase in numbers.
Studies of the genetic variation of the species using an investigative method called PSMC formed the background for these assertions. And now we have to concentrate a bit.
From one to many
All of an individual’s genes are called a genome. You have a genome, your mom has her own genome, your dog has one and the neighbour’s cat has yet another. These can be broken down into chromosomes and genes and base pairs, but you only have a single genome.
So, all of your chromosomes and genes are found in this one genome, but at the same time this genome is unique to just you and only you. Unless, that is, you have an identical twin or are a termite or belong to another species where the individuals are largely identical clones. (In the last case, it’s remarkable that you can read this.)
Here is the crux of the matter:
The PSMC method can use the information in the genes of a single individual of a species to map the history of the species.
You should therefore be able to see how the species developed over many generations, and estimate how many individuals there were at any given time, all based on a single genome.
Humans partially off the hook
Using this method, researchers found that the number of passenger pigeons was in free fall even before the arrival of the Europeans.
Although the species might not have become extinct, it would have shrunk significantly in any case, maybe to only a few hundred thousand individuals.
People were just the final factor in their demise. We may have pushed the passenger pigeons off the cliff, but the species was already on its way there.
So — according to the researchers behind the study in PNAS — it wasn’t just the Europeans’ fault.
It sounds almost too good to be true that you can come up with something so definitive based on information from just one or a few individuals. And in this case it is — at least if we’re to believe a new study that has recently been published in the journal Science.
Ineffective for passenger pigeons
The problem is that the PSMC method can’t be used on passenger pigeons. The new research in Science provides completely different results.
Leading molecular biologist Beth Shapiro is the main author of the Science article, and Tom Gilbert is one of the study’s contributors.
PSMC is based on the assumption that genetic variations occur relatively evenly all along the chromosomes that constitute the genome. That is, genetic changes are equally likely to occur at the ends of a chromosome as in the middle. But this turns out not to be the case for this species.
“Passenger pigeons don’t have the variation patterns that we’d expect, because of the strong selection on genes that appear to have been important throughout the species’ history. So it doesn’t work to use PSMC in this case,” said Gilbert.
In passenger pigeons, most of the genetic diversity was found at the ends of the chromosome. The middle of the chromosome showed little variation from one generation to the next as a result of the selection on these genes.
This fact may not sound revolutionary, but it yields completely different results if you try to read the history of the species based on the genome of a single individual.
You have to take into account that variations are greatest in certain parts of the chromosome rather than evenly distributed throughout. This makes the PSMC method unusable in this context.
Used another method
The researchers behind the article in Science didn’t use the PSMC method. Instead, they used mitochondrial DNA from 41 passenger pigeons as their starting point. Now we have to concentrate again.
Your DNA is not your only inheritance. Mitochondrial DNA is a distinct, separate inheritance found in certain cells called mitochondria.
Regular DNA is a combination of the inheritance from your father and mother. But mitochondrial DNA is only transmitted from your mother. Variations in mitochondrial DNA also occur due to mutations, and happen relatively consistently over time.
This is a different point of departure for understanding how a species develops over time, and the results can be quite different from those generated using the PSMC method.
In addition, the study presented in Science analysed the entire genomes from four passenger pigeons and compared them with two genomes from band-tailed pigeons (Patagioenas fasciata), one of the closest relatives of the passenger pigeon.
The final result was that the new study ended up with completely different answers about the passenger pigeons and why the species met its demise.
Genetic diversity
The new study is interesting for several reasons. It tells us about the genetic diversity of the passenger pigeon, but also supports an entirely different explanation for the species’ extinction.
Scientists previously believed that the larger the population of a species is, the more genetically diverse it will be. But this theory has turned out to be wrong, as the recent passenger pigeon research has shown.
According to the article in Science, the large population size appears to have enabled passenger pigeons to adapt and evolve more quickly and thus remove harmful mutations.
In species with fewer individuals, chance can cause a less beneficial mutation to persist, but chance plays less of a role in species with greater numbers of individuals.
“Mutations that provide a major evolutionary benefit would spread rapidly,” says Gilbert.
The fact that beneficial mutations became incredibly dominant so quickly simply led to the disappearance of other genetic variants.
This in turn led to the genetic diversity in the passenger pigeon being surprisingly low in relation to the number of individuals. This may have made the species more vulnerable to changes.
But that was not why the passenger pigeon died out.
Our mistake
“The passenger pigeon died out because of people,” is Gilbert’s short version.
The passenger pigeon wasn’t in trouble prior to Europeans arrival in North America. Nothing suggests that the species was struggling in any way.
Perhaps this isn’t that surprising. In the 19th century passenger pigeons were so numerous that there were contests to shoot as many of them as possible during a certain period of time. In one competition, the winner had shot 30 000 birds.
If nothing else, the story of the passenger pigeon has contributed to a greater understanding that even prolific species can become extinct.
Something to learn
The large grasshopper Melanoplus spretus from the western United States suffered the same fate. It went from a population of several trillion to zero in a few decades, possibly because farmers destroyed its breeding grounds. In Norway and across the whole of the North Atlantic, the great auk (Pinguinus impennis) died out after people harvested them in large numbers.
People ate passenger pigeons in huge amounts, but they were also killed because they were perceived as a threat to agriculture. As Europeans migrated across North America, they thinned out and eliminated the large forests that the pigeons depended on. The pigeons lived primarily on acorns.
As the species was already dying out, 250,000 birds — the last big flock — were shot on a single day in 1896. That same year, the last passenger pigeon was observed in Louisiana. It was also shot.
The pigeons were probably dependent on a large flock size to reproduce. Their instincts didn’t work when only a few individuals remained here and there.
The last passenger pigeon died in the Cincinnati Zoo in 1914.
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The politicians are seated in a semi-circle at a meeting of the council. One by one, they raise their voices as part of the deliberation. “I believe it is time we took a position on this,” says a black-blazered woman. “It’s not an industry that I want to support,” a second woman, wearing dark-rimmed glasses, reads into the official record.
“It’s time,” concludes the mayor, donning the heavy chain that is the insignia of his office, “to end the practice in our community.”
It is a fall meeting of the District of North Vancouver’s city council and they are discussing whether people should be allowed to keep pigeons. Councillors Lisa Muri, in the blazer, and Megan Curren, with the glasses, ultimately vote with the mayor in favour of an outright pigeon ban.
Coun. Matthew Bond, one of those who votes against, says skeptically, “I don’t necessarily see this as a good use of our time.” But the bylaw passes, four to two.
Something smells, though. Only one property in the community is known to harbour pet pigeons. Only one complaint about pigeons, dating back several years, is known to be active. Only one city councillor has recused herself from the discussion. “I have been in a situation like this,” Coun. Betty Forbes says, at the same meeting. “So I’m stepping aside.”
One plus one plus one equals . . . a conflict of interest?
Documents obtained by the CBC under access-to-information seem to bolster that view of events. The “situation” was that Forbes lived next-door to pigeons. That she did not like pigeons. And that after complaining to the city as a private citizen to no avail, she took matters into her own hands; after being elected to council in 2018, in an email to two fellow councillors, she requested a bylaw banning residents from keeping the birds.
Emails viewed by Maclean’s suggest that during the spring, Muri initiated a process to change the district’s pigeon ownership rules, and kept Forbes up to date on its progress. But the whole project has since run into trouble because it turns out Kulwant Dulay, Forbes’ neighbour, cares deeply about his pigeons. He cares enough to go to court.
His petition to B.C. Supreme Court, dated Dec. 4, seeks to have the bylaw declared illegal and set aside. It relies heavily on the CBC’s reporting, referencing emails between Forbes and Muri earlier this year that appear to reveal a plot to hatch the bylaw.
Dulay is arguing that Forbes’s involvement was “biased and bad faith and acting in a conflict of interest,” says Camille Chisholm, a lawyer representing the pigeon enthusiast. The district has retained its own lawyers and was expected to respond in January.
The same week as Dulay’s petition was filed, the District of North Vancouver announced it was tasking former B.C. privacy commissioner David Loukidelis with investigating how the pigeon ban came to be. His review, the district announced, will assess the “awareness” of conflict-of-interest rules by councillors. The process is expected to take a couple of months.
Dulay, Chisholm adds, has kept homing pigeons as pets for years—including during his time in India before he immigrated to Canada. “My neighbours in the front and back, everybody loves my pigeons,” says Dulay, adding that other than Forbes’s, he hasn’t had a complaint in 17 years. “Everybody comes to my house and looks at them. It looks cool, them flying around.” Some have names. One is called “Big Boss.” His favourite pigeon is blue and white. He said it always comes to his hand.
Dulay keeps his 15 birds in a coop that’s about as tall as the backyard fence and roomy enough for him to enter and move around. During the warmer months, he lets them out to fly around the neighbourhood, including over other people’s yards. He said they always return.
Lately, he has wondered whether Forbes has a problem with him, not his pigeons. He said she “never talks” to him, and notes that he has never complained about her two barking dogs, though he believes he might have reason to.
His across-the-street neighbour, meanwhile, has spoken in his support. “I’ve had opportunity to go over and see the coop,” Krista Page told council on Nov. 18. ”It is clean. There’s no foul smell. I’ve never met neighbours that keep a tidier driveway and home and everything.” Page noted there have been no complaints from the Dulays’ other next-door neighbour, adding: “I just feel that this is very much a misuse of power.”
Forbes declined an interview request from Maclean’s but insisted in an email that there is “another set of correct facts” to the story. “However, because the mayor has requested an inquiry of all council and himself,” the email added, “I am unable to make any comments at this time.”
Her only public response came at the end of the same meeting Krista Page attended. “If I have erred in any way,” she said, “I assure council and the community that it was done inadvertently and in good faith with my understanding, as a new councillor, of the conflict-of-interest rules.”
Muri echoed Forbes in an email to Maclean’s, saying: “We are currently reviewing the process of this bylaw, so it would be inappropriate for me to comment.” But a response to the petition later filed in court by her lawyers denies the councillor was aware of any interest Forbes could’ve had in a pigeon ban beyond one “in common with electors of the municipality generally.”
The submission argues that neither councillor stood to gain financially from the bylaw and doubles down on the councillors’ position that the ban is legitimate and serves to protect residents from current and future pigeon keepers who might “adversely impact them or their property.”
To some, this is more than a dispute between neighbours. Givo Hassko, who is on the board of the Vancouver Poultry & Fancy Pigeon Association, told council in November he believed this was a test case for corruption in Canadian politics writ large. “If there are no consequences to how council goes to change bylaws here locally or Canada-wide,” he said, “then anyone—anyone—would get a green light.”
Hassko set up a GoFundMe to help with Dulay’s legal fees. At the time of writing, it had raised $700. A single commenter named Wayne, who pitched in $55, offered this input: “It is important that pigeons are not homeless.”
Pigeon Patrol Products & Services is the leading manufacturer and distributor or bird deterrent (control) products in Canada. Pigeon Patrol products have solved pest bird problems in industrial, commercial, and residential settings since 2000, by using safe and humane bird
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Contact us at 1 877-4-NO-BIRD,(604) 585-9279 or visit our website at www.pigeonpatrol.ca
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Alarm bells were sounding in the United Kingdom in October. Nope, it wasn’t another economic crisis, but a bout of the so-called “zombie pigeon” disease.#
Pigeons were making odd movements and behaving strangely. They were twisted their necks to unnatural angles, were unable to eat, wandered aimlessly around in circles… Something was happening.
Experts pointed towards the cause: paramyxovirus. The disease, while not fatal to humans, is lethal to aviary animals that contract it.
A number of pigeons had to be euthanised on the Channel island of Jersey. As of October there were no recorded cases of paramyxovirus on the British mainland.
The birds, in addition to the twisted neck, lost weight due to the physical impossibility of eating and walked in circles with clear neurological signs of the brain, as confirmed by the veterinary analyses.
Seagulls in the Snow by Ron Hill Two Gulls loving the snow in an Uckfield Garden !!!
What is paramyxovirus?
The British government last updated their disease guidance for paramyxovirus back in 2018. It states that the disease does not usually affect humans though does affect pigeons, as the images suggest.
Signs of paramyxovirus infection in pigeons may include:
nervous signs, including trembling wings and heads, and twisting of the neck
partial paralysis of wings and legs (birds may fall over on landing and be unable to feed)
They also became thin from not being able to eat and not being able to sit still while they produce green feces.
How can the disease spread?
The disease is spread by direct contact between pigeons and through:
pigeon transporters that have not been adequately cleaned and disinfected
drinking water in lofts and transporters
pigeon fanciers carrying infection on their clothes, hands and feet
JSPCA Animal Shelter told the Mirror that the illness has no treatment “and many birds die within a few days”.
“Any that do survive will continue to shed the virus and be a risk to other birds,” a spokesperson added. “At the JSPCA, affected birds are humanely euthanased.”
This disease cannot affect humans, but it can cause conjunctivitis in those who handle sick birds.
Pigeon Patrol Products & Services is the leading manufacturer and distributor or bird deterrent (control) products in Canada. Pigeon Patrol products have solved pest bird problems in industrial, commercial, and residential settings since 2000, by using safe and humane bird
deterrents with only bird and animal friendly solutions. At Pigeon Patrol, we manufacture and offer a variety of bird deterrents, ranging from Ultra-flex Bird Spikes with UV protection, Bird Netting, 4-S Bird Gel and the best Ultrasonic and audible sound devices on the market today.
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Contact us at 1 877-4-NO-BIRD,(604) 585-9279 or visit our website at www.pigeonpatrol.ca
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A raving lunatic beheaded two pigeons in Bryant Park, proclaimed he was a “vampire” — and guzzled their blood in front of a horrified crowd, witnesses told The Post.
“He was holding up the pigeons and drinking their blood, letting the blood drip down his shirt,” recalled shocked onlooker Dominic D.
“He did it twice,” the 32-year-old said. “He was covered in blood. He said he was a vampire. It was pretty disgusting.”
Witnesses told The Post that the man threw one of the dead bird heads and splattered blood all over the shirt of a person who was eating lunch. He then calmly waited for cops to arrive.
“He was very calm when the police came,” explained Clarissa Plair, a 26-year-old Theology student who spends a lot of time in Bryant Park and has seen the pigeon perp before.
“He’s always here, yelling at people on the street,” she said. “He was telling [police] he’s a vampire.”
Authorities took a man into custody about 15 minutes later and transported him to St. Luke’s-Roosevelt Hospital for a pysch evaluation, according to officials.
Photos and video posted on Twitter showed the bloody aftermath, with several pigeons swooping in to mourn their fallen bird brethren.
While the man behind the fowl fatalities is known to sit in the Bryant Park fountain drinking beer, witnesses said he’s never gone after any of his feathered friends before.
Pigeon Patrol Products & Services is the leading manufacturer and distributor or bird deterrent (control) products in Canada. Pigeon Patrol products have solved pest bird problems in industrial, commercial, and residential settings since 2000, by using safe and humane bird
deterrents with only bird and animal friendly solutions. At Pigeon Patrol, we manufacture and offer a variety of bird deterrents, ranging from Ultra-flex Bird Spikes with UV protection, Bird Netting, 4-S Bird Gel and the best Ultrasonic and audible sound devices on the market today.
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Contact us at 1 877-4-NO-BIRD,(604) 585-9279 or visit our website at www.pigeonpatrol.ca
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Homing pigeons may share the human capacity to build on the knowledge of others, improving their navigational efficiency over time, a new Oxford University study has found.
The ability to gather, pass on and improve on knowledge over generations is known as cumulative culture. Until now humans and, arguably some other primates, were the only species thought to be capable of it.
Takao Sasaki and Dora Biro, Research Associates in the Department of Zoology at Oxford University, conducted a study testing whether homing pigeons can gradually improve their flight paths, over time. They removed and replaced individuals in pairs of birds that were given a specific navigational task. Ten chains of birds were released from the same site and generational succession was simulated with the continuous replacement of birds familiar with the route with inexperienced birds who had never flown the course before. The idea was that these individuals could then pass their experience of the route down to the next pair generation, and also enable the collective intelligence of the group to continuously improve the route’s efficiency.
The findings, published in Nature Communications, suggest that over time, the student does indeed become the teacher. The pairs’ homing performance improved consistently over generations — they streamlined their route to be more direct. Later generation groups eventually outperformed individuals that flew solo or in groups that never changed membership. Homing routes were also found to be more similar in consecutive generations of the same chain of pigeon pairs than across them, showing cross-generational knowledge transfer, or a “culture” of homing routes.
Takao Sasaki, co-author and Research Fellow in the Department of Zoology said: ‘At one stage scientists thought that only humans had the cognitive capacity to accumulate knowledge as a society. Our study shows that pigeons share these abilities with humans, at least to the extent that they are capable of improving on a behavioural solution progressively over time. Nonetheless, we do not claim that they achieve this through the same processes.’
When people share and pass knowledge down through generations, our culture tends to become more complex over time, There are many good examples of this from manufacturing and engineering. By contrast, when the process occurs between homing pigeons, the end result is an increase in the efficiency, (in this case navigational), but not necessarily the complexity, of the behaviour.
Takao Sasaki added: ‘Although they have different processes, our findings demonstrate that pigeons can accumulate knowledge and progressively improve their performance, satisfying the criteria for cumulative culture. Our results further suggest that cumulative culture does not require sophisticated cognitive abilities as previously thought.’
This study shows that collective intelligence, which typically focuses on one-time performance, can emerge from accumulation of knowledge over time.
Dora Biro, co-author and Associate Professor of Animal Behaviour concludes: ‘One key novelty, we think, is that the gradual improvement we see is not due to new ‘ideas’ about how to improve the route being introduced by individual birds. Instead, the necessary innovations in each generation come from a form of collective intelligence that arises through pairs of birds having to solve the problem together — in other words through ‘two heads being better than one’.’
Moving forward, the team intend to build on the study by investigating if a similar style of knowledge sharing and accumulation occurs in other multi-generational species’ social groups. Many animal groups have to solve the same problems repeatedly in the natural world, and if they use feedback from past outcomes of these tasks or events, this has the potential to influence, and potentially improve, the decisions the groups make in the future.
Pigeon Patrol Products & Services is the leading manufacturer and distributor or bird deterrent (control) products in Canada. Pigeon Patrol products have solved pest bird problems in industrial, commercial, and residential settings since 2000, by using safe and humane bird
deterrents with only bird and animal friendly solutions. At Pigeon Patrol, we manufacture and offer a variety of bird deterrents, ranging from Ultra-flex Bird Spikes with UV protection, Bird Netting, 4-S Bird Gel and the best Ultrasonic and audible sound devices on the market today.
Voted Best Canadian wholesaler for Bird Deterrent products ten years in a row.
Contact us at 1 877-4-NO-BIRD,(604) 585-9279 or visit our website at www.pigeonpatrol.ca
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FERAL PIGEONS, WHICH LIVE ON every continent in the world except Antartica, are famously adaptable—They shack up all over, from San Francisco to London to Mumbai.
They are also in Calgary, where around 200 of them have made their home on the roof of the South Health Campus, a 269-bed hospital. This was an unwelcome development, since pigeons can carry disease, and they poop a lot.
The hospital’s efforts to get rid of them—including with noise, which worked at first, before the birds got used to it—haven’t been successful, so recently they chose to get a little more serious. They’ve hired three baby peregrine falcons, according to the CBC, as a future anti-pigeon patrol.
A falconer, John Campbell, plans to release the falcons from the building, where it is hoped they will hunt down the pigeons and “other small game,” the CBC reports.
“You could [use] anything that would scare them, that would go after them as prey,” Campbell said. “It doesn’t have to be falcons but the falcons work very well.”
It will be a little time before the falcons get to the hunting, as just one has fledged so far. In the meantime, though, they’re being fed dead pigeons to give them a taste for pigeon blood.
Pigeon Patrol Products & Services is the leading manufacturer and distributor or bird deterrent (control) products in Canada. Pigeon Patrol products have solved pest bird problems in industrial, commercial, and residential settings since 2000, by using safe and humane bird
deterrents with only bird and animal friendly solutions. At Pigeon Patrol, we manufacture and offer a variety of bird deterrents, ranging from Ultra-flex Bird Spikes with UV protection, Bird Netting, 4-S Bird Gel and the best Ultrasonic and audible sound devices on the market today.
Voted Best Canadian wholesaler for Bird Deterrent products ten years in a row.
Contact us at 1 877-4-NO-BIRD,(604) 585-9279 or visit our website at www.pigeonpatrol.ca
Pigeon/Pigeon Patrol / Pigeons Roosing / Vancouver Pigeon Control / Bird Spikes / Bird Control / Bird Deterrent / PIgeon Deterrent / Surrey Pigeon Control / Pest / Seagull deterrent / Vancouver Pigeon Blog / Birds Inside Home / Pigeons in the cities / Ice Pigeons / What to do about pigeons / sparrows, Damage by Sparrows, How to Keep Raccoons Away, Why Are Raccoons Considered Pests / De-fence / Pigeon Nesting / Bird Droppings / Pigeon Dropping / woodpecker control / Professional Bird Control Company / Keep The Birds Away / Birds/rats/seagull/pigeon/woodpecker/dove/sparrow/pidgeon control/pidgeon problem/pidgeon control/flying rats/pigeon problems/ bird netting/bird gel/bird spray/bird nails/bird guard
