There could be twice as many bird species as we thought

There may be twice as many bird species as we thought, researchers say. We’ve just been fooled because a lot of these 18,000 birds look like each other.For a study published in the journal PLoS One, scientists led by George Barrowclough, an ornithologist at the American Museum of Natural History, looked at a random sample of 200 bird species. By analyzing their physical characteristics, like the color and size of their methods, they found that there were nearly two different species for ea