How are you supposed to react to wild animals?

Let's say wild animals such as snakes, giant spiders, coyotes, foxes, lizards, herbivores, and big cats, like cougars. Animals that could be found in the Great Plains and people don't immediately know how to react to them. Most importantly snakes 
Answers:
1. Turn and run away
2. Prepare to strike defensively if need be 
3. Stand still and don't move
4. Slowly walk away from the animal
5. Lower yourself flat on the ground as to not be seen so easily 

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