A tourist guide working in Bolivia has stumbled upon an enormous dinosaur footprint measuring 1.2m wide. Experts say it's one of the largest prints ever found of a carnivorous dinosaur, and a record for South America.
Despite their diminutive size, raptors were among the most terrifying dinosaurs to menace the Cretaceous Period. But as the discovery of a new dinosaur called Murusraptor shows, their plus-sized versions, aptly known as "megaraptors", were considerably worse.
Palaeontologists working in Argentina uncovered the remains of a Cretaceous-era dinosaur that featured the same kind of miniaturised arms found on the T. rex. These ancient creatures weren't closely related, so scientists now suspect that tiny arms evolved independently.