Of the 5000 or so species of mammals on the planet only female humans have permanent breasts.

The science of why human breasts are so big

Breasts are uniquely human— more than 5,000 mammals inhabit this planet, yet Homo sapiens are the only life forms with permanent breasts.

Every other mammal develops temporary breasts during ovulation or nursing in order to produce milk for their young.

Watch the video above to learn why humans evolved to have breasts and what they’re actually made of.

Following is a transcript of the video.

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 raises the question: Why are human breasts so big?…
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Source: https://www.businessinsider.com/why-are-human-breasts-big-2018-2