Toads are a group of tailless amphibians of stout build, with more or less warty skin. The true toads are in the order Bufonidae[?]. The type of the family is the common toad[?], Bufo bufo, and round it cluster a large number of species of the same genus, and some smaller genera.
That the shape of the body is not a safe guide in judging of amphibian groups is shown by certain species, such as Bufo jerboa, which in its slender form and extremely long limbs surpasses the typical frogs, whilst on the other hand, some true frogs (Rana), adapted to burrowing habits, are absolutely toad-like. The Bufonidae include terrestrial, burrowing, thoroughly aquatic and arboreal types; Rhinophrynus, of Mexico, may be described as an anteater.
The genus Bufo embraces about 100 species, and is represented in nearly every part of the world except the Australian region (with the exception of the introduced Cane toad Bufo marinus), Madagascar and nearly all other islands.
The natterjack, which differs in its shorter limbs with nearly free toes (which are so short that the toad never hops but proceeds in a running gait) and in usually possessing orange/red warts, green eyes & a pale yellow line along the middle of the back, is local in England, the south-west of Scotland, and the west of Ireland.
It is further remarkable for the very loud croak of the males, produced by a large vocal bladder on the throat which, when inflated, is larger than the head. Toads lay their eggs in long strings, forming double files in straight, jelly-like tubes.