Only 16 million years after the dinosaur-killing asteroid struck, ancient mammals known as 'thunder beasts' grew 1,000 times bigger.
A 20-story rock face in Alaska known as "The Coliseum" is covered with layers of footprints belonging to a range of dinosaurs, including a tyrannosaur.
A recent discovery of a fossil from China shows that a group of reptiles had a whale-like filter feeding technique 250 million years ago.
Scientists unearthed 330 million-year-old octopus fossil in Montana, which means octopuses have been around since before the dinosaurs.
With huge teeth and large eyes, Crassigyrinus scoticus was specially adapted to hunt in the coal swamps of Scotland and North America.
Thanatotheristes degrootorum is thought to be the oldest member of the T-Rex family.
Did dinosaurs, walking on all fours, use their hands to walk across a cave’s ceiling? Scientists have been puzzled by these odd fossils for decades.
The blue whale may no longer be the heaviest animal to ever inhabit Earth; there is now another contender.
The fossil comes from a strata that dates back 310 to 315 million years and marks the first Palaeozoic spider ever found in Germany.