Achtung!

Rattlesnakes. They receive their name for the rattle located at the tip of their tails. The rattle is used as a warning device when threatened.

http://en.wikipedia.org/wiki/Rattlesnake

Safety and identification

The rattlesnake is not cornered or imminently threatened, it will usually attempt to flee from encounters with humans, but will not always do so. Bites often occur when humans startle the snake or provoke it. Those bitten while provoking rattlesnakes have usually underestimated the range (roughly two-thirds of its total length) and speed with which a coiled snake can strike (literally faster than the human eye can follow). This can be particularly surprising since the snakes can strike without pulling their body back. Some rattle snakes have been seen striking up to an hour after death. This reflex hasn't been recorded in any other species. Heavy boots and long pants reinforced with leather or canvas are recommended for hikers in areas known to harbor rattlesnakes.

Guides are available through booksellers, libraries, and local conservation and wildlife management agencies, etc...

The advice given is to avoid contact with rattlesnakes by remaining observant and not approaching the animals. Hikers are advised to be particularly careful when negotiating fallen logs or boulders and when near rocky outcroppings and ledges where rattlesnakes may be hiding or sunning themselves. However, snakes will occasionally sun themselves in the middle of a trail, so such areas are not the only places where they are encountered. When encountering a rattlesnake on a trail, you are advised to keep your distance and allow the snake room to retreat.

Dammn it, couldn't I think of any other animal!?

)

PS:
I might be wrong tho. it would be nice if I am.