Mice on opposite North American coasts evolved the same way

House mice from cold environments (right) have evolved to become bigger than house mice from warm environments (left) in a few hundred years

Katya Mack

On opposite sides of North America, house mice have strikingly similar adaptations to cold climates, and have independently evolved changes to genes that drive their similar behaviours and hardiness.

House mice (Mus musculus domesticus) are native to Western Europe but have spread across the world thanks to their close association with humans. They arrived in the Americas more than 200 years ago and have since expanded into climates quite different from their original temperate home.



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