The United States, China, India and other developed nations produce the vast majority of the world’s birds.
But the countries that produce the least, such as Tanzania and India, are responsible for about half of all birds killed by hunting, according to a new study.
The study found that about one-third of all bird species in the world have disappeared due to human-related hunting.
More than half of the species lost in the last decade were previously known to be endangered or threatened, the study found.
The researchers looked at the birds that were killed and counted the number of bird species that were listed as threatened or endangered, and how many birds were found that were found in protected areas.
They found that the United States and China are responsible in at least 40 percent of all deaths of birds.
The United Kingdom is second in that category, accounting for about 15 percent.
The United States accounted for nearly half of wildlife loss since 1999.
The other countries that were responsible for more than 50 percent of the loss were India, Tanzania and South Africa.
The new study has been published in the journal Nature Communications.