Frogs are fascinating animals. Some of their adaptations are just plain bizarre, from hatching offspring through their backs to breaking toes to produce claws. One of the freakiest amphibians is the ...

A tadpole (stage 59, Xenopus tropicalis) at the beginning of metamorphosis (left) and a froglet (stage 66, X. tropicalis) after metamorphosis (right). The skeleton undergoes dramatic remodeling during ...