Timber rattlesnake

Adults usually grow to total length of 91–152 cm (35.8–59.8 in).[Most adult timber rattlesnakes found measure less than 100 to 115 cm (39 to 45 in) in total length and weigh on average between 500 and 1,500 g. Dorsally, they have a pattern of dark brown or black crossbands on a yellowish brown or grayish background. The crossbands have irregular zig-zag edges, and may be V-shaped or M-shaped. Often a rust-colored vertebral stripe is present. Ventrally they are yellowish, uniform or marked with black.[15] Melanism is common, and some individuals are very dark, almost solid black.[16]