Frog

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Rana temporia

The common frog or grass frog (Rana temporaria), also known as the European common frog, European common brown frog, European grass frog, European Holarctic true frog, European pond frog or European brown frog, is a semi-aquatic amphibian of the family Ranidae, found throughout much of Europe as far north as Scandinavia and as far east as the Urals, except for most of the Iberian Peninsula, southern Italy, and the southern Balkans. The farthest west it can be found is Ireland. It is also found in Asia, and eastward to Japan. The nominative, and most common, subspecies Rana temporaria temporaria is a largely terrestrial frog native to Europe. It is distributed throughout northern Europe and can be found in Ireland, the Isle of Lewis and as far east as Japan

Common frogs metamorphose through three distinct developmental life stages — aquatic larva, terrestrial juvenile, and adult. They have corpulent bodies with a rounded snout, webbed feet and long hind legs adapted for swimming in water and hopping on land. Common frogs are often confused with the common toad (Bufo bufo), but frogs are easily distinguished by their longer legs, hopping movements, and moist skin, whereas toads crawl and have a dry 'warty' skin. The spawn of the two species is also different, with frogs laying their eggs in clumps and toads in long strings. The common frog is very similar to its close relative the moor frog (Rana arvalis). Where both species occur together the most reliable way to tell them apart is by looking at their metatarsal tubercles, a small spur on the hind feet next to the innermost toe: in common frog it is soft and small, less than a third of the length of the innermost toe, while in moor frog it is hard and approximately half the length of the innermost toe. Common frog and moor frog also have different calls, and for a short period during the breeding season moor frog males may become blue in color, while common frog males at most get a faint blueish tint.

There are 3 subspecies of the common frog, R. t. temporaria, R. t. honnorati and R. t. palvipalmata. R. t. temporaria is the most common subspecies of this frog.

The adult common frog has a body length of 6 to 9 centimetres (2.4 to 3.5 in). In addition, its back and flanks vary in colour from olive green to grey-brown, brown, olive brown, grey, yellowish and rufous. However, it can lighten and darken its skin to match its surroundings. Some individuals have more unusual colouration—both black and red individuals have been found in Scotland, and albino frogs have been found with yellow skin and red eyes. During the mating season the male common frog tends to turn greyish-blue (see video below). The average mass is 22.7 g (0.80 oz); the female is usually slightly larger than the male.

The flanks, limbs and backs are covered with irregular dark blotches and they usually sport a chevron-shaped spot on the back of their neck and a dark spot behind the eye. Unlike other amphibians, common frogs generally lack a mid-dorsal band but, when they have one, it is comparatively faint. In many countries moor frogs have a light dorsal band which easily distinguishes them from common frogs. The underbelly is white or yellow (occasionally more orange in females) and can be speckled with brown or orange. The eyes are brown with transparent horizontal pupils, and they have transparent inner eyelids to protect the eyes while underwater, as well as a 'mask' which covers the eyes and eardrums. Although the common frog has long hind legs compared to the common toad, they are shorter than those of the agile frog with which it shares some of its range. The longer hind legs and fainter colouration of the agile frog are the main features that distinguish the two species

Males are distinguished from females by being smaller and having hard swellings known as nuptial pads, on the first digits of their forelimbs, which are used to grasp females during mating. During the mating season males' throats often turn white, and their overall colour is generally light and greyish, while the female is browner, or even red.

These smooth-skinned frogs can grow to an average weight of 22.7 grams and length of seven to ten centimeters (2.8-3.9 in) with colors varying from gray to green, brown, yellow, or red and may be covered in blotches. The underside is white or yellow, often with spots.

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