Frogs belong to the family of amphibians that consist of freshwater and inland vertebrates, but differ from other amphibians by their tailless bodies.
The Greek frog (Rana graeca) lives in temperate forests, mountainous and highland pastureland near colder rivers and brooks. Their body colors are adapted to their environment and are usually in yellow, red, olive or gray colored shades and have spots all over them. Their bellies are white or yellow. Their necks are of a darker color with a characteristic lighter line in the middle.
The European fire-bellied toad (Bombina bombina) lives in water habitats of clear still waters or slow streams in lowland areas. Their body color variates from green to light green and their top sides are spotted with dark spots, while their belly color variates from orange do bright red with dark patterns.
The Yellow-bellied toad (Bombina variegata) settles in all sorts of still waters all across middle and southeast Europe. Their top sides are greyish–brown to dark olive color, and their bellies and extremities are yellow with black spots. A specific feature of these frogs are their heart-shaped pupils.
The Moor frog (Rana arvalis) settles in moist meadows and swamp lands. Their skin is smooth, greyish, yellowish or brown, while their bellies are bright and without spots. They have horizontal pupils with a dark–brown mask over each eye.
