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Animals

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harbor porpoise

FERTILE FOLDS In harbor porpoises (one shown), females have vaginal folds (3-D endocast shown below) that may help them exert control over fertilization.

composite image of various animals

BRAIN GAME  Despite being relatively large, a brown bear’s brain is sorely lacking in nerve cells, while a raccoon’s cat-sized brain is packed full, finds a new study that tallies these neurons in carnivores.

morpho dragonfly

BETTER BLUES  SN's article about the wings of this morpho dragonfly creating natural blue colors in a really complicated way was our top online story in 2017.

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