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What is the defence system of Lemmings based on?

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The lemming defence system is thought to be based on aposematism (warning display). Fluctuations in the lemming population affect the behaviour of predators, and may fuel irruptions of birds of prey such as snowy owls to areas further south.
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How big is a lemming and how much does it weigh?

Lemmings measure around 13 – 18 centimeters (5 – 7 inches) in length and weigh around 23 – 34 grams (0.05 – 0.07 pounds).

How are lemmings different from all other rodents?

Lemming behaviour and appearance are markedly different from those of other rodents, which are inconspicuously coloured and try to conceal themselves from their predators. Lemmings, by contrast, are conspicuously coloured and behave aggressively towards predators and even human observers.

How big do Lemmings get when they jump off cliffs?

In popular culture, a longstanding myth holds that they jump off cliffs and commit mass suicide. Lemmings measure around 13–18 cm (5–7 in) in length and weigh around 23–34 g (0.8–1.2 oz). Lemmings are quite rounded in shape, with brown and black, long, soft fur.
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