If you spend a lot of time with certain frogs, you’ll probably notice a behavior called toe-tapping: a rapid up-and-down movement of the middle toes of the hind legs. People have known about toe-tapping for a long time, but despite being so widely observed, there have been very few experimental investigations of the phenomenon, and its function is hardly clear.

Read more at my Animal Minds blog: Why Do These Frogs Tap Dance.