Habitat: Along the perimeter of the U.S. and in the Rocky Mountain states.

Risks: The big teeth and claws. Tip: Don’t sneak up. Wear bold, contrasting colors (they see only in black and white). If one attacks, some experts say bears lose interest if you play dead.

Habitat: Found just about everywhere.

Risks: As soon as their superfine spray dries, it begins to smell.

Tip: If a skunk stomps its feet, it’s warning you to leave. If you get sprayed, soak in anything acidic, like tomato juice, vinegar or Massengill douche.

Habitat: You probably won’t meet one unless it’s trapped in your house.

Risks: Don’t touch! Bats often carry rabies.

Tip: Hold a 2-by-2-foot sheet of chicken wire over your head. In an enclosed space, they’ll fly right to it and hold on while you carry them outside.

Habitat: Found mostly in the West and Northeast.

Risks: They cannot shoot quills. But their speedy tails whip around and release them on contact.

Tip: They’re slow, so try outrunning them. If all else fails, porcupines can be easily bribed: they love peanuts and pretzels.

Habitat: Once rare, but a reintroduction plan may have worked too well. They’re now in all states.

Risks: Avoid their knobby legs, which are covered in skin-puncturing spurs.

Tip: Watch the color of their heads: the madder they are, the bluer they get.