The –est Animals

This killifish can go from egg to sex in two weeks

Unpredictable and rapidly vanishing rain-puddle nurseries dictate this need for speed

killifish

OH GROW UP Scientists knew from lab tests that a kind of killifish (a male shown) beats the records of all other vertebrates known for maturing fast. Now researchers have clocked it in the wild, and it’s even faster.

R. Blažek

By Susan Milius

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