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May 21, 2008, 5:46 pm

Dinosaur footprints in the Arabian desert

Fossilised footprints of a herd of at least two different species of dinosaurs have been discovered for the first time by scientists working in the Republic of Yemen.

[Independent.co.uk]

One of the set of tracks, made about 150 million years ago, are the footprints of a small herd of four-legged sauropod dinosaurs .

The other set of tracks was made by a single, two-legged ornithopod dinosaur with a distinctive footprint of three huge toes.

What is mud is made from and how are footprints made?