Massasauga
Sistrurus catenatus • Order: Squamata, Suborder: Serpentes, Family: Viperidae, Subfamily: Crotalinae, Genus: Sistrurus, Species: S. catenatus
North America, ranging from central New York and southern Ontario through parts of the midwestern United States such as Michigan, Ohio, Illinois, and Wisconsin, extending down to portions of the southwest.
Look up Massasauga in the Snake Encyclopedia →Family
Order: Squamata, Suborder: Serpentes, Family: Viperidae, Subfamily: Crotalinae, Genus: Sistrurus, Species: S. catenatus
Conservation
Listed as Vulnerable on the IUCN Red List, facing significant threats from habitat fragmentation, wetland drainage, and direct persecution by humans.
Physical Description
Features a striking pattern of dark, rounded or hourglass-shaped blotches along the back and smaller spots on the flanks against a grayish-brown background. Scales are strongly keeled, and the body is moderately robust with a distinct tail featuring a keratinous rattle.
Size & Dimensions
Typically ranges from 60 to 75 cm (24 to 30 inches) in total length as adults, with maximum recorded lengths reaching around 100 cm.
Habitat
Found primarily in wet prairies, marshes, sedge meadows, wet woodlands, and occasionally drier adjacent upland areas, utilizing crayfish burrows or dense vegetation for cover.
Diet & Feeding
Preys primarily on small mammals such as mice and voles, as well as small reptiles and amphibians, utilizing an ambush hunting strategy.
Reproduction
Ovoviviparous, giving birth to live young. Typical litter sizes range from 5 to 20 neonates, with mating occurring in the spring or late summer.
Look-alikes
Frequently confused with other small rattlesnakes or harmless snakes like the Eastern Milk Snake (Lampropeltis triangulum) and Fox Snake (Pantherophis vulpinus), which lack the prominent rattle and have different head shapes.
Conservation Status
Listed as Vulnerable on the IUCN Red List, facing significant threats from habitat fragmentation, wetland drainage, and direct persecution by humans.
Cultural Significance
Plays an important ecological role as a predator controlling small mammal populations and serves as an indicator species for the health of wetland ecosystems.
Notable Features
Features a caudal rattle used as a warning signal and specialized facial pits between the eye and nostril capable of detecting infrared radiation from warm-blooded prey.