In spring 2014, in anticipation of the centenary of the passenger pigeon's extinction, Radio Canada featured the Redpath Museum's two mounted specimens in a program called 鈥溾��. What we learned from this broadcast was that in the 18th and 19th centuries the passenger pigeon was the most abundant bird species on Earth.
The first European drawing of the species, in the Codex canadensis (left), was made by the Jesuit missionary Louis Nicolas in the early 1700s. He wrote a brief description of what he witnessed: 鈥淥umimi, or ourit茅, or dove. One sees such great numbers of this bird at the first passage in spring and fall that it is incredible.鈥�
Passenger pigeons聽were easy to catch because they stayed together in large flocks and perched on the lower branches of trees. They were considered an easy source of food because they could be beat out of their perching branches with sticks and then bagged. In 1866 in Ontario, it was reported that one flock of birds, 300 miles (482 kilometres) long and one mile (2 kilometres) wide, darkened the skies for 14 hours as they flew by overhead. Unlike the domesticated carrier pigeon used for messages, these were wild birds. Even their feathers were popular for bedding; for a time in Saint-J茅r么me, Quebec, every dowry included a bed and pillows made of pigeon feathers. By 1900, there we no passenger pigeons left in the wild. By 1914, there was just 29-year-old Martha at the Cincinnati Zoo. Then on September聽1, 1914, Martha was found lying dead on the bottom of her cage. The passenger pigeon was now extinct. It had gone from billions of birds to zero in about a century, probably less.
What happened to the passenger pigeon?
According to an聽article in , which聽reviewed聽several scientific studies on passenger pigeon genomes and population fluctuations, the demise聽of the passenger pigeon is more complicated than was once thought. It seems their population ping-ponged regularly and, according to 六合彩开奖结果聽herpetologist David Green,聽the聽bird鈥檚 disappearance聽is partly attributable to the Allee effect, a behavioural phenomenon聽where certain types of animals require the presence of other individuals to thrive.
鈥淗er mate died a few years before her,鈥澛燝reen said. 鈥淲hen large populations of bird species like passenger pigeon, or even large groups of breeding frogs like the chorus frog, fall below their sustainable threshold size, they can鈥檛 recover."
Despite the Allee effect, the chief cause of extinction for the billions of passenger pigeons was the destruction of eastern North American forests and hunting.
鈥淚t was the first time we could be certain that humans had caused a species鈥� extinction,鈥澛爏aid Green.
鈥� Learn more about the Redpath Museum's endangered and extinct species exhibit