In order to survive, animals have instinctive reactions to the weather, migrating birds being just one example. By knowing how game animals react in differing weather conditions can up a hunter’s chances of a successful kill.
Deer depend heavily on scent to protect themselves from predators. They usually respond to a strange scent by bugging out before hunters get close. Deer move into the wind to better pick up scents. To take advantage of this, a hunter must move and stay downwind of his prey. This can be determined by the old wet finger trick.