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A reconstructed Neanderthal skeleton, right, and a modern human version of a skeleton, left, on display at the Museum of Natural History in New York in 2003. A new study confirms that early humans who lived in colder places adapted to have larger bodies. Frank Franklin II / AP Big bodies are good for cold places. That's the gist of a foundational rule in ecology, which has been around since the mid-1800s: animals that live in colder places tend to have larger bodies, especially birds and mammals that need to regulate their body temperatures. For example, some of the largest whale and bea...

Colder Climates Meant Bigger Bodies For Ancient Humans Big bodies are good for cold places. That's the gist of a foundational rule in ecology that has been around since the mid-1800s: Animals that live in colder places tend to have larger bodies, especially birds and mammals that need to regulate their body temperatures. For example, some of the largest whale and bear species have evolved in the coldest reaches of the planet. The rule applies broadly to modern humans too. Populations that evolved in colder places generally have bigger bodies. That's also true of human ancestors, a new study f...