A fossilised oviraptor found on top of a clutch of eggs confirms that at least some dinosaurs sat on or near their eggs to keep them warm, as birds do. The eggs contain late-stage embryos that developed at temperatures of up to 38°C.

There is already strong evidence that some dinosaurs brooded eggs like birds do . Several fossils of adult oviraptors – bird-like dinosaurs that were around 2 metres long, including their tails – have been found on or near clutches of eggs.

Yet not all …