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 […]