Most countries throughout the world participate in the $40-million-per-year culinary trade of frog legs in some way, with 75 percent of frog legs consumed in France, Belgium and the United States.

Worm-like amphibians known as caecilians may have lost their legs thanks to the same genetic tweaks that snakes have. An analysis of the amphibians’ genomes suggests that caecilians and snakes – ...