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natural selection

Graphic showing functional optimality drives repeated evolution of extreme sabertooth forms

Extreme Sabre-Tooth Morphology: Perfect for Puncturing

abstract illustration of aging man and dna

Genetic mutations that promote reproduction tend to shorten human lifespan

Bat teeth

Fruit, nectar, bugs and blood: How bat teeth and jaws evolved for a diverse dinnertime

Squirrel researcher walking along the Alaska Highway in the Yukon, Canada. Image credit: Ben Dantzer

Squirrels that gamble win big when it comes to evolutionary fitness

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