In the UK's Chester Zoo, the incredibly rare sight of an eastern black rhino giving birth during the day was captured on camera. Keepers at the zoo were stunned to witness such an event as these ...

Marigold, a capybara at the Cape May County Zoo, gave birth to five pups on Friday, just weeks after her sister, Buttercup, ...

Similarities to the womb and placenta of female mammals indicate a response to common evolutionary challenges in pregnancy.

You might expect a stingray to lay eggs, like many of the world’s fish. However, stingrays give birth to live young, similar to sharks. One Instagram video from Explaining the Ocean provides a ...

Scientists may finally have an explanation for the longstanding mystery of why blue whale calves are rarely sighted, an advance that could help better conserve the critically endangered species. There ...

In seahorses, it is the males who carry offspring to term. The females lay their eggs into a special brood pouch on the ...