January 15, 2013

When a Fish Grows a Big Brain

Veronique Greenwood, Time


Marrabbio2/Wiki Commons

From our perspective, guppies lead simple lives—eating, reproducing, and, after a couple of years, dying. Apply a little evolutionary pressure, though, and they can evolve larger brains that make them better at cognitive tasks. Nifty, but there’s a downside: brainy guppies produce dramatically fewer babies than their little-brained counterparts.

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TAGGED: Fish, Brain Size

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