Massasauga
Sistrurus catenatus • Order: Squamata, Suborder: Serpentes, Family: Viperidae, Subfamily: Crotalinae, Genus: Sistrurus, Species: S. catenatus
North America, primarily distributed through parts of the central and eastern United States and parts of southern Ontario, Canada.
Look up Massasauga in the Snake Encyclopedia →Family
Order: Squamata, Suborder: Serpentes, Family: Viperidae, Subfamily: Crotalinae, Genus: Sistrurus, Species: S. catenatus
Conservation
Listed as Least Concern globally by the IUCN, but many regional populations face significant threats such as habitat fragmentation, wetland drainage, agricultural expansion, and direct persecution.
Physical Description
Thick-bodied snake with a distinctively wider, triangular head, cat-like vertical pupils, keeled scales, and a patterned dorsal surface featuring dark, rounded blotches along the back with smaller alternating spots on the flanks. A grayish or brownish background coloration with a rattle present on the tail tip.
Size & Dimensions
The specimen pictured appears to be a smaller individual or juvenile around 30 to 50 cm. Adults typically range from 50 to 75 cm in total length, with a maximum recorded length of around 100 cm.
Habitat
Wetlands, swamps, marshes, bogs, and adjacent wet prairies, floodplains, and forests. Elevational range varies from near sea level up to several hundred meters depending on the region.
Diet & Feeding
Primarily feeds on small mammals such as mice and voles, as well as small reptiles and amphibians. Uses an ambush hunting strategy, relying on heat-sensing pits and strike-and-release tactics.
Reproduction
Viviparous (gives live birth). Mating occurs typically in spring or late summer, resulting in a litter size of about 5 to 20 young born in late summer or early autumn.
Conservation Status
Listed as Least Concern globally by the IUCN, but many regional populations face significant threats such as habitat fragmentation, wetland drainage, agricultural expansion, and direct persecution.
Cultural Significance
Plays an important role in local wetland ecosystems as a predator of small rodents. Often misunderstood by the public, leading to conservation challenges and habitat protection initiatives.
Notable Features
Possesses specialized heat-sensing pit organs located between the eye and nostril to detect warm-blooded prey, and is equipped with a rattle on the tail composed of keratin segments.