The hagfish is a slime-emitting ocean-dweller that's remained unchanged for 300 million years--and it shows. It has a skull (but no spine), velvet smooth skin, and a terrifying pit of a mouth that ...
A hagfish fossil found in Illinois, USA, that dates to about 330 million years ago looks quite a lot like today's hagfishes, though, suggesting that these animals may have long since found an ideal ...
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