Mount Emei Lizard
Mid- to Late Jurassic - 160 million years ago
Western China (named after Mount Emei)
Length 20 meters (60 feet)
Weight: 3,600 kg (8,000 lb)
The best protection Omeisaurus had from predators looking for a high protein meal was its sheer size (up to 3,600 kilos or 8,000 lbs) which may have deterred all but the most determined. As long as Omeisaurus remained healthy it was unlikely that it would find itself under attack from its main predator, Yangchuanosaurus. Consuming up to a tonne (1000 kilos, or 2200 lbs) of plants each day, Omeisaurus swallowed food whole and digestion was aided by gastroliths (stomach stones).