Lemming populations also undergo periodic boom and bust cycles. Although lemmings are similar to other , they differ in their bright colours and aggressiveness toward . There are at present 18 species within four groups that include the collared and true lemmings. Usually found in or near the Arctic , lemmings are a crucial part of the diet for predators such as the .
Source: http://www.bbc.co.uk/nature/life/Lemming
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