Crayfish get anxious, too

Shock a crustacean, and its subsequent behavior changes

LIGHT SHY  Stressed, anxious crayfish spend less time exploring well-lit areas, a new study finds. 

Jean-Paul Delbecque

Crayfish under duress show signs of anxiety, scientists report in the June 13 Science. The results provide clear evidence of the complex behavior in invertebrates and hint at anxiety’s ancient origins.