Again, bird populations are declining in North America. According to the Bird Conservancy of the Rockies, bird populations have decreased by 29%, meaning almost 3 billion birds are gone. The most upsetting part: this decline happened in only 50 years.
North America isn’t the only place this is happening. In a 2018 report, 40% of the world’s bird species were found to be in decline, according to All About Birds. Birds are in major trouble. And you can probably guess why.
Putting habitat loss aside, U.S. Fish & Wildlife Service reports that predation by cats, collisions with windows, vehicles, electrical lines, electructions, oil pits, and poison are all top threats to bird populations. However, there are a couple of threats that stand out from the rest.
Cats annually kill 2,400,000,000 birds out of 3,324,184,012 human-related deaths. According to ABC Birds, approximately 63 extinctions among mammals, reptiles, and birds were partially because of cats. The second deadliest threat is collisions with building glass, which annually kill 599,000,000 birds. (Cats, by themselves, account for almost 70% of fatalities!)