Evolution

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guppies!

GUPPY GAINS Trinidadian guppies from the Guanapo River basin (shown) make unhelpful changes in gene activity when they first enter a new environment. Those missteps speed up evolution, a new study suggests.

river dolphin fossil skull and jaw

The skull and jaws of Isthminia panamensis, a new fossil dolphin from Panama, provides clues to the evolution of river dolphins in the Americas.  

frog

CALLING CARD  Male túngara frogs like this one attract their mates with a series of chirpy croaks. When picking between two calls, females tend to prefer a lower tone and more quickly repeated calls, but adding in a third suitor with an unattractive song may change a female’s preference between the two other males.  

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