BITE CLUB Regardless of where an ecosystem is, the predators and prey appear to follow roughly the same rule in their relative rates of increase, a new study says.
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.
The skull and jaws of Isthminia panamensis, a new fossil dolphin from Panama, provides clues to the evolution of river dolphins in the Americas.
Nicholas D. Pyenson/NMNH Imaging/Smithsonian Institution