Tetrapods were and are vertebrates with four limbs - which today includes amphibians, reptiles, birds
and mammals (although some, such as snakes, have lost limbs during their more recent evolution).
The first air-breathing tetrapods probably evolved from fleshy-finned fish resembling Eusthenopteron and
Panderichthys into creatures such as Ventastega and Acanthostega, some 380-360 million years ago