crayfish

Neither overfishing nor pollution, writes David Wilcove in his book The Condor’s Shadow, “has endangered as many species of fish, mussels, amphibians, and crayfish as has habitat destruction.”

While some research has found that morphine can have analgesic effects on crayfish, we don’t yet know what type of receptor it’s targeting, though it probably relates to these evolutionarily early starts at an opioid system.

As with humans, crayfish and capybaras, if you look you’ll find the biochemical markers of the poor bees’ cognitive change.

But there is also a lot we don’t know, including about decapod crustaceans such as crabs, lobsters, crayfish, and shrimp.

“Fish and river crayfish passing through Utrecht have been given their own doorbell, so they can continue the trek to their spawning grounds without having to wait too long,” read one report.