‘Never skip leg day’ – Tetrapods evolved superfast

Sustained rapid rates of evolution explain how tetrapods evolved from fish.

Two creatures standing in mud. The y are long with tails and flat heads, and four legs. One if big and brown, and one is smaller and lighter brown
The aerial scene depicts two Late Devonian early tetrapods – Ichthyostega and Acanthostega – coming out of the water to move on land. Footprints trail behind the animals to show a sense of movement. Credit: Davide Bonadonna.