Aruba Island Rattlesnake
Crotalus unicolor • Order: Squamata, Suborder: Serpentes, Family: Viperidae, Subfamily: Crotalinae, Genus: Crotalus, Species: C. unicolor
Endemic to the island of Aruba in the Caribbean Sea, specifically restricted to the island's northwestern and western arid hills and rocky limestone terraces.
Look up Aruba Island Rattlesnake in the Snake Encyclopedia →Family
Order: Squamata, Suborder: Serpentes, Family: Viperidae, Subfamily: Crotalinae, Genus: Crotalus, Species: C. unicolor
Conservation
Critically Endangered according to the IUCN Red List, facing severe threats from habitat destruction, feral predators, and historical over-collection for the pet trade.
Physical Description
Features a light grayish-brown, tan, or reddish-brown ground color overlaid with darker, often indistinct diamond-shaped or crossbanded dorsal markings that fade toward the tail. The head is relatively distinct from the neck, and the underside is pale yellowish or cream with darker flecking. The tail terminates in a rattle.
Size & Dimensions
Typical adults reach total lengths of 70 to 100 cm (28 to 39 inches), with maximum recorded lengths approaching 100 cm or slightly more.
Habitat
Inhabits arid, dry scrublands, rocky hillsides, and limestone terraces (terai), often utilizing rock crevices, caves, and sheltered areas under boulders to escape high daytime temperatures.
Diet & Feeding
Feeds primarily on small mammals, birds, and lizards, employing an ambush hunting strategy and relying on sensory heat-pitting to locate endothermic prey.
Reproduction
Viviparous (gives live birth), typically producing litters of 5 to 15 young during the summer months after a gestation period of several months.
Look-alikes
Other island-dwelling rattlesnake species or mainland neotropical rattlesnakes, though its restricted endemic island range makes geographic location the primary distinguishing factor.
Conservation Status
Critically Endangered according to the IUCN Red List, facing severe threats from habitat destruction, feral predators, and historical over-collection for the pet trade.
Cultural Significance
A symbol of Aruba's unique biodiversity, featured on local conservation awareness programs and stamps, holding significant value in local ecological education.
Notable Features
Exhibits insular dwarfism compared to many mainland rattlesnake relatives, and possesses a specialized heat-sensing pit organ located between the eye and the nostril.