A new study from Tel Aviv University and the Weizmann Institute revealed that over the last 20,000-50,000 years, birds have undergone a major extinction event, inflicted chiefly by humans, which caused the disappearance of about 10 to 20 percent of all avian species. The vast majority of the extinct species shared several features: they were large, they lived on islands, and many of them were flightless.
Click here for original story, Humans behind extinction of hundreds of bird species over the last 50,000 years
Source: Phys.org