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Humans may have influenced evolution of dogs’ eye colour, researchers say

Dark eyes are more common in domesticated dogs, possibly because we consider this trait more friendly

Human preferences for a friendly face may have steered the evolution of canine eye colour, researchers have suggested.

Ever since canines were domesticated, some time between 15,000 and 50,000 years ago, humans have selected – whether consciously or not – particular traits in their dogs.

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