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Identifying Frogs


At the present time all the images you can find on FrogsWatch.comare of the Common Frog as this is the species that is present in the FrogsWatch.com ponds. A large part of e-mails we receive are about identifying Frogs so we have written this brief guild to help.


Some helpful features which can be helpful in identified frogs are the paratoid gland, the dark area behind the eye, the vocal sac which can be below or at the side of the mouth, the ear drum, dorsal folds, Webbing and pads on the feet and hands and the length of the legs.


Brown Frogs

Common Frog or Grass Frog

The Common Frog can vary in colour greatly from light yellow, green, olive, brown, and towards red often with markings in patches, marbled and spots, the underside is white to pale yellow. Size is up to 10 cm. relatively short legs. The dorsal folds which run the length of the back are closely spaced. The ear drum can be seen clearly with a dark mask behind the eye. The males have internal vocal sac’s and are only usually heard in the mating season February to April, some times a defensive scream can be heard. Lives mostly on the land and returns to the water for breeding.


Green Frogs

Marsh Frog Edible Frog and Pool Frog

The male of the Green Frogs have a white or gray vocal sac’s at the corners of the mouth and are more vocal than the Brown Frog. The Green Frogs don’t have a visible mask behind the eyes, and are more aquatic. Size is up to 15cm, colouring variable from green to brown often with a pale yellow or green stripe along the centre of the back.


Toads

Common Toad and Natterjack Toad

Toads tend to be drier looking with warts and stouter in form with variable colouring. Size is up to 15cm Common Toad and the Natterjack Toad up to 10cm. In the water the female will lay thousands of eggs in long strings. The toads tend to be nocturnal with the Natterjack Toad found in sandy areas.  


Spawn

In March and April Frogs spawn is laid in clumps of jelly like eggs and can usually be seen on the surface. Also in March and April Toads lay their spawn in long chains a couple of meters long amongst the water plants. The difference can clearly be seen in the images on thus page.


Identifying Frogs

Toads spawn

Image © Brian Valentine (LordV)


Frogs spawn

Frogs spawn