Cerulean Warbler (photo)
After announcing that its international bi-annual volunteer bird count, October Big Day, would take place on October 19, 2019, researchers at Cornell Laboratory of Ornithology and their colleagues from other avian organizations, shared with the world the devastating news that North America has taken a serious hit in its bird population - a 3 billion bird loss over the last 50 years.
A good portion of the affected birds reside in grasslands and they are frequent visitors to suburban areas. Birds like sparrows, warblers, blackbirds, and finches, had populations that were 53 percent higher in 1970. Grassland birds, like them, made up the majority of bird species that declined since that time in North America.
The main reasons for the demise of the North American birds cited are: habitat loss, pesticide use, and the consequential loss of insects for birds to eat. Most recently, severe weather changes, fires, and droughts doubtless contributed to the decline in bird populations.
This video by the American Bird Conservancy brings this loss home in this video:
The whole study, Decline of the North American Avifauna, was published in the journal Science on September 19, 2019. Members of the following organizations were involved in collecting and reporting the research: