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 ...

(CNN) — The popularity of the famous French delicacy of cuisses de grenouille, or frogs’ legs, is threatening the existence of certain frog species, a group of more than 500 environmental campaigners ...