Tadpoles (Various Sizes)

A tadpole (also known as a pollywog or polliwog) is a larval frog. In this stage it breathes by means of external or internal gills, is at first lacking legs, and has a finlike tail with which it swims as most fish do, by lateral undulation. As a tadpole matures, it metamorphoses by gradually growing limbs and then (in the case of frogs and toads) absorbing its tail by apoptosis (controlled cell death). Tadpoles depe...