Rattlesnake

Rattlesnakes are a common poisonous snake renowned for the rattles on their tails, which alert other nearby animals of their presence and agitation. They are found throughout the American west, their natural habitat ranging from hot arid plains to cool mountain outcrops.

In Red Dead Redemption, rattlesnakes can be hunted and skinned for goods that can later be sold to merchants for cash.

The player may be able to harvest snake oil for the snake oil merchant, Nigel West Dickens, as shown in the Gentlemen and Vegabonds trailer.

Incidentally, the player can also find a rattlesnake when Treasure Hunting, usually when opening a chest or looking under rocks.

StatsSnake.jpg
The rattlesnakes' stats:

Length: 3' 5 to 8'

Weight: Up to 20lbs

Roaming Areas: Woodlands, lakeshores, Deserts and...

Achievement
The player must kill a rattlesnake to obtain the following achievement:
 * Unnatural Selection: Kill one of every animal species in the game in any game mode.