Dry mouth and a rapid heartbeat is a sign for moderate dehydration. Vomiting and diarrhea is a strong indication for severe dehydration.

Staying near a source of water is a good idea when building a shelter. You should avoid natural hazards like cliffs and dry river beds.

Sun exposure, frostbite and dehydration can take days to kill you, hypothermia happens in a matter of minutes.

Drinking any amount of salt water will further dehydrate you and in larger quantities cause organ failure.

The ability to shelter yourself from the elements, start a fire, clear brush, defend yourself, and provide clean drinking water are the most important tools. A compass is a very important tool, however if you are lost, the most recommended strategy is to shelter in place for those who will be looking for you.

Tongue. Venomous snakes tend to have elliptical pupils, while non-venomous snakes have round pupils. This is not foolproof though, as the venomous coral snake has round pupils. Not to mention you don’t want to get that close to a snake to find out!

Sleeping on the ground can lead to loss of body heat. You’ll retain more warmth by piling grass or pine needles on the ground to sleep on.

Bacteria begins to break down at 160° Fahrenheit.

Hypothermia happens during all seasons and temperatures, usually due to exposure to water that leads to the lowering of your body temperature.

Eating frozen snow and ice will reduce your core body temperature and can lead to dehydration.

Insect eggs can be found in moist areas under rocks and inside rotten tree logs or stumps.

The human body begins severe dehydration, that leads to death in 3 days.