There are three rattlesnake species in North Carolina, according to the Carolinas Poison Center: the Timber "Canebrake" ...

Of the 32 snake species in Tennessee, only four are venomous: copperhead, cottonmouth, timber rattlesnake, and pygmy ...

Some nonvenomous snakes (such as a rat snake) can mimic the triangular shape of venomous snakes by flattening their heads when threatened, so never go by head shape alone. Can you see its eyes?

Within the 17 snake species found in New York, three are venomous. Here's what to know, and how likely you are to see them in ...

But often it’s more complicated than that. A triangle-shaped head doesn’t always mean a snake is venomous, and a narrower head doesn’t mean you’re in the clear. Many non-venomous snakes ...

“The main things to note are that head shape and pupil shape cannot exclusively be used to determine whether or not a snake is venomous, as both features are not stagnant,” Hay said.

Only the copperhead and the timber rattlesnake are found in the central Pennsylvania area. There are several ways to identify venomous snakes, including pupil size, head shape and pattern.