In the animal kingdom, pregnancy rarely follows the rules, with many species being pregnant for a year or more.

The menstrual cycle plays an essential role in human reproduction. However, most other animals don't experience menstruation. So, which other species have periods, and what's the evolutionary point of ...

Have you ever wondered how long whales are pregnant? With the massive size of whale babies, it comes as no surprise that whales have long gestation periods. Dive in to find out how long whales are ...

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CHITTENANGO, N.Y. — The Wild Animal Park in Chittenango announces Jasmine the giraffe is pregnant! This is exciting news as a giraffe's pregnancy period can last more than a year. It seems like it was ...

Many mammals deliver in minutes after long pregnancies. See which species have the quickest births to help newborns thrive.

Breeder animals are an important focus in farm animal welfare assessments as they typically live the longest lives and are at the greatest risk for suffering due to their longevity. For breeding pigs, ...

The Cincinnati Zoo & Botanical Garden is expecting a new critter. Isla the tamandua is pregnant and expecting a pup at the end of December, according to the zoo's Facebook page. Scientists from the ...