Distinguishing closely related animal species can sometimes feel like an exercise in semantics. But there are real ...

Prepare to be amazed by the astonishing world of the 100 rarest animals ever documented on our planet! From creatures teetering on the brink of extinction to those so elusive they were once thought to ...

Open wide! The gaping gob of a pelican eel can expand into a voluminous sac for trapping elusive prey in the dark ocean depths.

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