Life & 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.  

jellyfish

The moderate sting from this Chrysaora pacifica jellyfish comes from a small number of stinging nematocysts that are long enough to penetrate the skin of its prey (or an accidental victim). More painful species have longer stingers and more of them, a new study finds.

Life & Evolution

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