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.

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 ...

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 ...

Fossil skulls reveal how extinct mammals smelled the world, with new research linking olfactory bulb size to gene counts.

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.

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 ...

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From its long, flexible trunk to its loud trumpeting sounds, there’s a lot to admire about an elephant. But how much do you know about these massive creatures? Where do they live? How big can they get ...

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 ...

Boobs are back. Also, they never went away. This is part of Boobs Week—read the whole thing here. Breasts are usually not the first thing we notice on an elephant. You might have never noticed them at ...