Mosasaurus was one of the largest members of the mosasaur family, which were the top predators in the oceans during the age of dinosaurs.
Around 120 million years ago, tarantulas first appeared on the Gondwana supercontinent in what is now the Americas, and then dispersed into Africa, Australia and India.
The smallest stegosaur footprint ever found has been discovered in China, and suggests that the baby pranced around on hind feet.
Researchers unearthed the fossil of a pterosaur with opposable thumbs, making it the oldest known animal with thumbs on Earth.
Digging deep into T.rex's history helped researchers determine how many of these apex predators ever existed.
The researchers say that brain plasticity like this may not just be a trick of the ants. Other animals could do it too, and we may only just be noticing.
Cheetahs are unique members of the big cat family, with bodies built for acceleration and short bursts of incredible speed.
Four dead gray whales have washed up in San Francisco Bay in eight days, prompting fears that the species is under threat in the area.
No animal is less related to you than a sea sponge, and they've got the genes and nerveless, anus-less bodies to prove it.
Archaeologists in Saudi Arabia have uncovered bones at a burial site that reveal the domestication of dogs in the area happened much earlier than previously believed.
During the Jurassic period, long-necked dinosaurs gulped down pink stones and then migrated hundreds of miles across what is now the American Midwest.
A months-long rescue operation transported the last of nine stranded giraffes to their new home in a mainland sanctuary.
Adding speed bumps to a road in a national park in Zanzibar has reduced the number of collisions between cars and one of Africa's rarest primates.
Scientists in China have discovered a new species of deadly snake and have named it after a shape-shifting snake goddess from Chinese mythology.