Lizards and toads are conspicuous in the more desert areas.
Some of the poison-secreting glands attain a greater complication of structure and are remarkable for their large size, such as the so called "parotoid" glands on the back of the head in toads and salamanders.
Frogs and toads occur wherever insect food is procurable, and their distribution is a world-wide one, with the exception of many islands.
Of which (toads, for instance) are entirely Ivc, Inferior vena edentulous.
Every bayou contains alligators; and reptiles of various species, such as turtles, lizards, horned toads, rattlesnakes and moccasins are abundant.
The tree-frogs, Hylidae, with which the arboreal Ranidae were formerly grouped, show in their anatomical structure a close resemblance to the toads, Bufonidae, and are therefore placed far away from the true frogs, however great the superficial resemblance between them.
The former type is exemplified by the toads and the lower Ecaudata, whilst the latter is characteristic of the true frogs (Ranidae), although when quite young these batrachians present a condition similar to that which persists throughout life in their lower relatives.
The larynx, which is rudimentary in most of the Caudata and in the Apoda, is highly developed in the Ecaudata, and becomes the instrument of the powerful voice with which many of the frogs and toads are provided.
Frogs and toads are represented by scores of species, some of which, e.g.
Although toad-like it is not really related to the toads proper, but belongs to the family Discoglossidae, characterized by a circular, adherent tongue, teeth in the upper jaw and on the palate, short but distinct ribs on the anterior vertebrae, and convex-concave vertebrae.
Large toads and frogs are common, as are scorpions, tarantula spiders, butterflies, hornets and stinging ants.
It grows rarely to a length of 4 ft.; it never bites, and feeds chiefly on frogs, toads and fishes, but mice are never taken.
Salamanders, toads and frogs are numerous, and crocodiles abound.
Many have the power of changing colour, a faculty which they share only with various frogs, toads and fishes.
Phrynosoma, with about a dozen species, the "horned toads" of California to Texas, and through Mexico.
The arboreal life of the tropical forests has developed the treeclimbing habit among snakes as well as among frogs and toads, and also the habit of mimicry, their colour being in harmony with the foliage or bark of the trees which form their " hunting-grounds."