Mammals that live in very cold environments have behavioural adaptations that help reduce the rate at which they lose heat - VCE - SSCE Biology - Question 24 - 2005 - Paper 1

The correct answer is C: curling up into the shape of a ball.

Curling up helps to minimize the surface area exposed to the cold environment, thereby reducing heat loss. This behavioral adaptation is commonly observed in various mammals as a strategy to conserve body heat in extreme cold. Other options, while they may present certain survival tactics, do not directly address heat conservation as effectively as curling up.