The oilbird, or guacharo, is not a morbidly obese bird. It’s called “the whale of the air” because like its larger, ocean-dwelling brethren, it contained oil—oil that was harvested yearly, and which lit lamps and greased up South American society.
There are almost 10,000 bird species flying the skies, roaming the lands, and diving the waters of our planet. Some of them are pretty similar to one another, perhaps because the two species diverged only relatively recently. But some of them are so unique you won't believe they're not made up.