If you are threatened by large mammals and you don't have any weapons, then build a fire at night – they won't like it. If you are caught out, then surprise is your best defense. Sit quietly until they are approaching, then make a sudden commotion. Shout, flap your arms, use anything you can find to make a noise.
If you are lost in desert heat, your main aim will be to keep cool. The biggest desert killers are heatstroke and dehydration, which can come on very quickly.
Keep your head cool at all costs, even if it means peeing on your hat. You shouldn't go into a desert without a hat, but if you are caught short, make one from another piece of clothing. Wear light-coloured clothing in the desert.
The Moab Desert contains two major rivers – the Colorado and the Green. Finding one of them is the key to getting out. Following a river will eventually lead to civilization. Plants, insects and birds need water, so signs of life like these indicate a water source nearby.
Canyons provide shade and might contain water sources that could lead to bigger rivers. Find a canyon that runs downhill – it is a good sign that water is nearby since water runs downhill.
Only drink running water. Stagnant water is likely to be contaminated with dead animals and other debris, which could give you diarrhea that could finish you off altogether.