TIMBER RATTLESNAKE

Timber rattlesnakes may be found throughout the wooded hillsides of the Allegheny National Forest, but are usually found in association with rock outcrops and large boulders.

There are two color phases, black and the less common yellow phase. Crossbands are V-shaped and are dark-brown to black on the yellow phase. The black phase has a heavy stipling or flecking of dark browns or blacks. Timber rattlesnakes can reach 36 to 54 inches in length.

Source and picture here: