Commonly known as the bullsnake, Pituophis catenifer sayi is a large, non-venomous snake found in North America. It inhabits prairies, grasslands, and agricultural fields. Known for its mimicry, it can imitate a rattlesnake by flattening its head and body, vibrating its tail, and hissing loudly to deter predators.

Pituophis catenifer sayi, commonly known as the bullsnake, is native to North America. It is primarily found in the central and western parts of the United States, including states such as Texas, Oklahoma, Kansas, Nebraska, South Dakota, and parts of Minnesota and Wisconsin. Its range also extends into the southern regions of Canada and northern Mexico.

Bullsnakes typically inhabit open grasslands, prairies, and savannas, as well as agricultural fields and semi-arid regions. They are adaptable to a variety of environmental conditions but prefer areas with sandy or loose soil that facilitate burrowing.

As a terrestrial species, bullsnakes occupy a niche as both predator and prey in their ecosystem. They primarily feed on small mammals such as rodents, but also consume birds and their eggs, making them important for controlling rodent populations. Their burrowing behavior provides them with shelter and aids in thermoregulation, allowing them to thrive in both temperate and semi-arid climates.