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Animals

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guppies

LIKES FLASHY GUYS  Brain size in a female guppy (left) turns out to affect her taste in males. Bigger brains go with a preference for a colorful guy (right) instead of some dim dud.

new dino evolutionary tree

NEW WAY TO RELATE  The dinosaur evolutionary tree just got a makeover. One outcome of the proposed rearrangement is that meat-eating evolved twice in dinosaurs (in groups represented by Tyrannosaurus rex, bottom middle, and Staurikosaurus, right), as did traits associated with plant-eating (groups represented by Brontosaurus, left, and Triceratops, top middle). 

image of nine mouse placentas

MOMMY MICE  A pregnant mouse’s placenta develops differently depending on her immune system. This wheel shows nine developing placentas, some with normal immune cells and some without. The image is one of the winners of the 2017 Wellcome Image Awards.

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