Scientists in western Canada have found the largest lump of fossilised dung from a meat-eating dinosaur ever discovered -- and they think it came from a tyrannosaurus rex.

The fossil, known as a coprolite, weighs seven kilograms and contains partly-digested bone fragments that the scientists believe came from a herbivorous dinosaur about the size of a cow.

Some of the bone is so well preserved that it could yield samples of DNA, so scientists could find out more about the genetic make-up of the dinosaur that ended up as the T.

Rex's last meal.

The fragments were crushed, showing that tyrranosaurs -- the most fearsome predators ever to roam the earth -- crushed their food rather than swallowing it in lumps as modern crocodiles do.