Some sharks and even a salamander retain their fetuses for years sometimes before giving birth. So, what animal has the longest gestation period? Here are the 5 longest periods in the animal kingdom.

A genetically engineered pig kidney helped Towana Looney enjoy 130 days without the need for dialysis before the organ was ...

Kipi, a 4-year-old reticulated giraffe and first-time mother, had only been at the Maryland Zoo for a few months when she ...

The Wildlife World Zoo earlier this month welcomed a baby reticulated giraffe, and visitors can meet her at the West Valley venue now.

Towana Looney, a woman in her fifties from the southern state of Alabama, had received the genetically modified pig kidney on ...

Finty, who was saved from an abattoir, recently gave birth to a foal named Sammy A neglected donkey saved from an abattoir by a Cornish animal sanctuary ... due to their long gestation period.

Colossal, a genetics startup, has birthed three pups that contain ancient DNA retrieved from the remains of the animal’s ...

Nine-banded armadillos nearly always give birth to quadruplets. How can they give birth to four identical armadillo pups?