Why are human breasts so big?

Breasts come in different shapes and sizes. But there’s one thing they all have in common. They are unique to humans. More than 5,000 mammalian species inhabit this planet. Yet, Homo sapiens are the only life forms with permanent breasts. Some may call this human anomaly sexy. But it also begs the question: Why are human breasts so big and were they an evolutionary mistake?

Every other mammal develops temporary breasts during ovulation and/or nursing. Basically, their purpose is

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