Breeding Has Made Dogs' Heads Incredibly Diverse

A cocker spaniel mix puppy. Credit: stock.xchng

From Live Science:

To get a sense of the not-so-subtle ways humans have influenced the course evolution, one wouldn't need to look further than Fido.

A new study reveals that the variety of skull shapes among domestic dogs has become just as diverse as the variety between other mammal species, such as bears, weasels, and seals. In fact some dog breeds’ heads vary in shape by more than the variation between cats and walruses.

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