Like all pit vipers, A. contortrix is generally an ambush predator; it takes up a promising position and waits for suitable prey to arrive.
One exception to ambush foraging occurs when copperheads feed on insects such as caterpillars and freshly molted cicadas.
When hunting insects, copperheads actively pursue their prey.
Juveniles use a brightly colored tail to attract frogs and perhaps lizards, a behavior termed caudal luring (see video: ).
In the Southern United States, they are nocturnal during the hot summer, but are commonly active during the day during the spring and fall.

Unlike other viperids, they often "freeze" instead of slithering away, and as a result, many bites occur due to people unknowingly stepping on or near them.
This tendency to freeze most likely evolved because of the extreme effectiveness of their camouflage.
When lying on dead leaves or red clay, they can be almost impossible to notice.
They frequently stay still even when approached closely, and generally strike only if physical contact is made.
Like most other New World vipers, copperheads exhibit defensive tail vibration behavior when closely approached.
This species is capable of vibrating its tail in excess of 40 times per second— faster than almost any other non-rattlesnake snake species.
Like all pit vipers, A. contortrix is generally an ambush predator; it takes up a promising position and waits for suitable prey to arrive. One exception to ambush foraging occurs when copperheads feed on insects such as caterpillars and freshly molted cicadas. When hunting insects, copperheads actively pursue their prey. Juveniles use a brightly colored tail to attract frogs and perhaps lizards, a behavior termed caudal luring (see video: ). In the Southern United States, they are nocturnal during the hot summer, but are commonly active during the day during the spring and fall.
Unlike other viperids, they often "freeze" instead of slithering away, and as a result, many bites occur due to people unknowingly stepping on or near them. This tendency to freeze most likely evolved because of the extreme effectiveness of their camouflage. When lying on dead leaves or red clay, they can be almost impossible to notice. They frequently stay still even when approached closely, and generally strike only if physical contact is made. Like most other New World vipers, copperheads exhibit defensive tail vibration behavior when closely approached. This species is capable of vibrating its tail in excess of 40 times per second— faster than almost any other non-rattlesnake snake species.
Agkistrodon contortrix