Rattlesnakes are a group of venomous snakes of the genera Crotalus and Sistrurus of the subfamily Crotalinae ("pit vipers"). The 36 known species of rattlesnakes have between 65 and 70 subspecies, all native to the Americas, ranging from southern Alberta and southern British Columbia in Canada to central Argentina.

Rattlesnake! is the fourth studio album by post-hardcore band A Static Lullaby. The album was released through Fearless Records on September 9, 2008. The album was produced by Steve Evetts who also produced all previous albums by A Static Lullaby except for Faso Latido which was produced by Lou Giordano (Taking Back Sunday, The Color Fred). It is their first release to carry the Parental Advisory sticker. This is the last album released by the band before their break-up in January 2012.