The common frog (Rana temporaria), also known as the European common frog, European common brown frog, or European grass frog, is a semi-aquatic amphibian of the family Ranidae. They have smooth skin that varies in colour from grey, olive green and yellow to brown. They have irregular dark blotches, a dark stripe around their eyes and eardrum, and dark bars on their legs. They are able to lighten or darken their skin to match their surroundings. Outside the breeding season, common frogs live a solitary life in damp places near ponds or marshes or in long grass. They will migrate to bodies of water such as garden ponds to spawn. Common frogs are found throughout much of Europe as far north as northern Scandinavia inside the Arctic Circle and as far east as the Urals, except for most of Iberia, southern Italy, and the southern Balkans. Other areas where the common frog has been introduced include the Isle of Lewis, Shetland, Orkney and the Faroe Islands. It is also found in Asia, and eastward to Japan.