Why do humans have much less body hair than most mammals?
Show answer & explanation
Answer: Better sweat cooling
Better sweat cooling ✓ — Correct! One leading explanation is that less body hair let sweat evaporate more efficiently, helping early humans stay cooler during long activity in hot environments.
Better camouflage — Wrong. Camouflage matters for some animals, but it does not explain why humans evolved powerful sweating together with reduced body hair.
Faster muscle growth — Wrong. Muscle growth is not the main trade-off here. The bigger evolutionary clue is heat control.
More Human Evolution & Society questions
- Why did clothing later split into casual and formal dress?
- If clothing began as a tool, why is nudity often treated as inappropriate?
- What problem did early clothing most likely solve first?
- Why didn’t humans just grow thick fur back instead of making clothes?
- Less hair makes cold easier to feel. Why didn’t that wipe humans out?
- If less hair helped, why didn’t humans become fully hairless?