They lay eggs, have feathers and fly – but are birds mammals? Here's how birds and other animals classify based on the six main types of animals.

Studies demonstrate that other animals dream. However, their experience depends on their lifestyle and brain anatomy.

Sixty-six million years ago, our ancestors lived through the most violent event in the Earth's history. How did small, insignificant mammals survive a doomsday asteroid?

All mammals have hair, but sometimes they've evolved to appear naked. Cetaceans are the largest group of hairless mammals, made up of animals including whales, dolphins, and porpoises. This makes ...

‘Mammals’ Review: James Corden Is a Jealous Husband in Amazon’s Unnerving Oddity Corden plays a temperamental chef who begins to worry that his wife is having an affair in this half-hour ...

How can animals that need to breathe air manage to sleep underwater? When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. If marine mammals want ...

If you define the menopause in the narrow sense of the ending of menstruation, most mammals cannot undergo it because they do not menstruate to begin with.

Why do we see, or not see, certain animals Many mammals are true hibernators and remain dormant through the winter, but a lot of them stay active, at least to some degree.

They lay eggs, have feathers and fly – but are birds mammals? Here's how birds and other animals classify based on the six main types of animals.