Question

The musk ox has a large body size and small appendages. How do these characteristics enable it to survive in the tundra?

Answer 1

Big body size and small appendages help musk oxen conserve heat and energy in the cold, windy tundra:

- Lower surface-area-to-volume ratio: A large body has relatively less surface area per unit mass, so it loses heat more slowly (Bergmann’s rule). This reduces the energy needed to maintain a warm core.
- Reduced exposed extremities: Small ears and short legs minimize exposed surface area where heat can be lost and reduce risk of frostbite (Allen’s rule).
- Thermal inertia and energy economy: Bigger animals have greater heat storage and more fat reserves and a lower mass-specific metabolic rate, which helps survive long, food-scarce winters.
- Complementary adaptations: Thick underwool (qiviut), fat layers, and vascular adaptations (e.g., countercurrent heat exchange in the limbs) further reduce heat loss.

Together these traits let musk oxen keep core temperature with less energy in the harsh tundra environment.