Why do kangaroos hop?
Show answer & explanation
Answer: Most energy-efficient movement
Hopping intimidates predators — Wrong. Hopping isn't intimidation—it's energy efficiency. Kangaroos hop because elastic tendons store/return energy like springs.
Most energy-efficient movement ✓ — Correct! Elastic energy storage! Kangaroo hopping: most efficient locomotion at high speeds! Mechanism: (1) Achilles tendons act like springs—store elastic energy on landing. (2) Energy returns on push-off (90% recovery). (3) Minimal muscle work needed. Faster hopping = MORE efficient (opposite of running). At 20+ km/h, hopping uses less oxygen than walking! Long tail provides balance and counterweight. Large hind legs + small front legs = bipedal hopping best. Can't walk backwards. Reaches 70 km/h!
Strengthens leg muscles daily — Wrong. Hopping does use leg muscles, but evolved for energy efficiency—elastic tendons recycle energy like springs, not for muscle building.
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