WASHINGTON (Reuters) - Surmising even the physical appearance of a dinosaur - or any extinct animal - based on its fossils is a tricky proposition, with so many uncertainties involved. Assessing a ...

While it is not quite as big as a Tyrannosaurus rex skeleton, fossilized poop can help paleontologists recreate lost worlds. It can tell scientists what extinct animals like dinosaurs ate, but more ...

As far as arachnids go, a creepy new species of assassin spider in Australia seems to be par for the course. However, these creatures used to be much bigger. Long before T-Rex debuted, ancient waters ...