Pain may keep predators away, in squid anyway

Squid that have lost a tentacle seem to be a bit more skittish of sea bass than squid with all of their appendages. Compared with healthy squid, the injured ones start their defensive behaviors, including inking, sooner, when the bass are farther away, researchers report May 8 in Current Biology. The finding suggests that even though the injured squid have a higher risk of being attacked, their injury also makes them more sensitive to predators, increasing their chance of survival. The finding may also explain why behaviors such as anxiety and heightened sensitivity, which appear counterproductive, linger even after a threat is in the distant past, the scientists say.