Life & Evolution

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pink salmon

Adult male pink salmon develop a hump on their back during their spawning migration. New research indicates that, under higher levels of atmospheric carbon, fewer fish may reach this stage of life.

Yersinia pestis bacteria

TINY KILLERS  Acquiring one gene and one mutation allowed these plague bacteria, Yersinia pestis (shown in yellow in a flea’s digestive system in this colored scanning electron micrograph), to cause deadly pandemics. 

A new app compiles millions of records of species worldwide and allows users to add sightings. 

Life & Evolution

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