Size
The sizes of copperheads average between 24 and 36 inches. Specimens to 42 inches are not a rarity, notes the website South Carolina Reptiles and Amphibians. Copperheads have what the "National Audubon Society Field Guide to Reptiles and Amphibians" describes as a "stout" body.
Head
The head of the copperhead lacks markings, but does feature the telltale copper tint. The eyes help identify this species as a pit viper, with the pupils elliptical, much like those of a cat. The head is large and triangular. Two small dots, known as facial pits, occur between the nostrils and the eyes. These are heat sensitive organs that help lead the copperhead to its warm-blooded prey, including rodents and birds.
Markings
The sides and back of the copperhead vary in color between individuals, with shades such as pink, tan and brown the dominant color. Across the back and the snake's side are a series of chestnut colored cross-bands, with most resembling the shape of an hourglass. These bands extend the entire length of the body. The juvenile copperhead looks similar to the adult, with the exception of possessing a yellow tail tip. This feature aids in their hunting, as they twitch it about to lure curious prey close enough to catch.
Telltale Behavior
Habitats that include plenty of vegetation and debris are ideal for the copperhead snake. It uses its coloration to blend into its surroundings. The copperhead, despite being a close cousin of the more aggressive water moccasin, chooses to remain quite still when presented with a threat, hoping to avoid detection. The snake will bite if you harass or try to handle it, but only as a last resort. Before striking, copperheads have a tendency to vibrate their tails rapidly, although they lack the rattles possessed by rattlesnakes.