Lemmings can be found in the areas that are marked black. Lemmings are NOT upright walking animals with green hair and blue clothes. That's only in the computer game. They can swim through lakes that are over 1 km long. In the computer game, they cannot do this unless you gave them a diving suit in Lemmings 2 and Lemmings Chronicles.
Lemmings are mammals, thus they always have the same body heat.
If lemmings are jumping down a cliff as in the computer game, they DON'T do it because they have suicidal tendencies. Their body is stocky, in size it is about 7.5 - 15 cm long. Living in burrows it sleeps the winter through, hibernating under the snow covered ground. The English documentary film maker David Attenborugh watched lemmings in the tundra. So it's prove that lemmings DON'T throw themselves off cliffs and slopes.