First, no one is sure why we, or any other animal, dream. During the past century, however, scientists have made significant progress in understanding the factors that influence sleep and dreaming.

National Geographic estimates there are between 50 billion and 430 billion birds populating the planet, outnumbering humans by up to approximately 50 times. Spread across 9,700 species, according to ...

Viewers of Mammals season 1 are wondering how many episodes are in the series and when each new episode comes out. Mammals is a darkly comedic British drama that explores the complexities of modern ...

Tusks are a striking feature of many animals -- elephants, hippos, warthogs, walruses -- and are often sought-after by humans. But no birds, fish or reptiles today sport this extreme and ever-growing ...

A new book dives into the evolutionary history of mammals. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Shortly after dinosaurs got their ...

A new book, The Rise and Reign of the Mammals by paleontologist Steve Brusatte, explores how our ancestors emerged, evolved, and took over the world. Reading time 10 minutes Deep time is a headache.

Rachael has a degree in Zoology from the University of Southampton, and specializes in animal behavior, evolution, palaeontology, and the environment.View full profile Rachael has a degree in Zoology ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. The idea that most biologically male members of a species are ...

Tusks are a striking feature of many animals — elephants, hippos, warthogs, walruses — and are often sought-after by humans. But no birds, fish or reptiles today sport this extreme and ever-growing ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Tusks are a ...