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The origin of the order name Anura—and its original spelling Anoures—is the Ancient Greek alpha privative prefix ἀν-(an-from ἀ-before a vowel) 'without', [6] and οὐρά (ourá) 'animal tail'. [7] meaning "tailless". It refers to the tailless character of these amphibians. [8] [9] [10] The origins of the word frog are uncertain and ...
The oldest fossil "proto-frog" Triadobatrachus is known from the Early Triassic of Madagascar (250 million years ago), but molecular clock dating suggests their split from other amphibians may extend further back to the Permian, 265 million years ago.
The decline in amphibian and reptile populations has led to an awareness of the effects of pesticides on reptiles and amphibians. [177] In the past, the argument that amphibians or reptiles were more susceptible to any chemical contamination than any land aquatic vertebrate was not supported by research until recently. [ 177 ]
The pig frog is green or grey-green in color, with brown or black blotching. It has fully webbed feet, a sharply pointed nose, and large tympana (eardrums). The Pig frog is sexually dimorphic in size and coloration, the males also have a larger tympanum than the females.
[24] [25] These early ancestors of carnivorans would have resembled small weasel or genet-like mammals, occupying a nocturnal shift on the forest floor or in the trees, as other groups of mammals like the mesonychians and later the creodonts were occupying the megafaunal faunivorous niche.
Otherwise known as the giant ditch frog, the amphibian is one of the largest frogs in the world, weighing in at over 2 pounds (almost 1 kilogram) with a length of up to 8 inches.
Anura is an order of animals in the class Amphibia that includes frogs and toads. More than 5,000 species are described in the order. More than 5,000 species are described in the order. The living anurans are typically divided into three suborders: Archaeobatrachia , Mesobatrachia , and Neobatrachia .
The wood frog lives farther north than any other North American amphibian. Glucose in the frog’s cells protects its body from damage caused by freezing, although nearly a third of the body ...