APRIL 15, 2019
by Richard Schuster, Amanda D. Rodewald, Joseph Bennett, Peter Arcese And Scott Wilson, The Conversation
Many bird populations are crashing, largely because they migrate such long distances and are at risk from human influence at every link in their migratory chain.
One favourite, the tiny Canada warbler, is among those that find themselves in trouble. Although this bird weighs only as much as a AAA battery, each spring it flies more than 5,500 kilometres from its winter home in South America to breed in Canada, stopping in Mexico, Texas and Michigan along the way. The Canada warbler makes this incredible journey as many as eight times over the course of its life.
Unfortunately, like many North American songbirds, the Canada warbler is at risk of extinction. Deforestation and human development projects are of the utmost concern to Canada warblers and other birds. More than one-third of North America's 1,154 bird species are suffering population declines.