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S. c. catenatus
Adults are not large, ranging from 45 to 75 cm (18 to 30 inches) in length. Its color pattern consists of a grey or tan groundcolor with a row of large rounded brown/black blotches or spots down the centre of the back and three smaller rows of alternating spots down each side. The diet consists of a variety of small vertebrates, including mammals, lizards and snakes, as well as invertebrates such as centipedes. However, mammals and reptiles make up their bulk of their diet. Adults feed mainly on rodents, while juveniles usually prey on reptiles: more often lizards in western populations and snakes in eastern ones.
It occurs in various habitats ranging from swamps and marshes to grasslands, usually below 1500 m elevation.