For sheep horns, bigger is not better

Trade-offs between studliness and survival keep less endowed sheep in the mix

HORNY GENES  This big-horned Soay ram will fight other males of his species for females on the St. Kilda archipelago during the spring rut. His ample horns, however, may not necessarily give him the best competitive edge, genetically.

Arpat Ozgul

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