Black-necked Garter Snake

Thamnophis cyrtopsis

The black-necked garter snake (Thamnophis cyrtopsis) is a species of medium-sized, non-venomous snake native to North America, known for its adaptability to a variety of habitats including woodlands, grasslands, and near water sources like ponds and streams. Characterized by its slender body, this snake typically measures between 18 to 28 inches long. Its most distinctive feature is the striking dark or black markings that encircle its neck, contrasting with the rest of its body, which is usually olive-green to brown with lighter-colored stripes running along its length. These lateral and dorsal stripes, along with its checkered pattern, help the snake blend into its environment.

Black-necked garter snakes are primarily diurnal, although they may become more active in the cooler hours of the morning and late afternoon. Their diet mainly consists of amphibians, small fish, and invertebrates, making them efficient hunters in and around aquatic habitats. This species is known for its docile nature but will emit a foul-smelling musk as a defense mechanism if threatened. Its ability to thrive in diverse environments and its tolerance to a range of temperatures have enabled the black-necked garter snake to establish a stable presence across its geographical range, spanning the southwestern United States and into parts of Mexico.