About 1 in 3 vertebrate species is used, eaten or traded by humans, study finds

A cheetah pouncing on a gazelle. A bear snatching a fish out of the water with its claws. 

And the most dangerous predator of them all? A human and their pet bird dancing to Gangnam Style. Scientists who set out to quantify humanity's impact on our 46,755 fellow species have found that we are the most prolific exploiters of animals-by far.

Compared to wild predators that have roughly the same body size as us and have similar appetites, we capture or kill nearly 100 times as many vertebrate species, on average. Orcas, for instance, have a range that's similar to ours, along with comparable social behaviors. Yet of the 121 types of vertebrates eaten by the so-called killer whales, humans also consume 83 of them-along with 10,337 others in the ocean alone.