Ostrich, albatross and pelicans are amongst some of the biggest birds on Earth.
Reed-threaded vertebrae, some of which date to nearly 600 years ago, were found in tombs in coastal Peru. This unusual mortuary practice may have been a way to reassemble desecrated remains.
A government-funded backhoe removing a wooden boardwalk has badly damaged a unique dinosaur trackway in Utah, witnesses say.
Magnetism is a force of nature produced by moving electric charges.