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Eastern diamondback rattlesnake at the Saint Louis Zoo Detail of rattle. The eastern diamondback rattlesnake is the largest rattlesnake species and is one of the heaviest known species of venomous snake, with one specimen shot in 1946 measuring 2.4 m (7.8 ft) in length and weighing 15.4 kg (34 lb).
The third largest rattlesnake is the Mexican west coast rattlesnake (Crotalus basiliscus), which reaches 2.04 m (6 ft 8 in) long and 7.7 kg (17 lb) mass, [87] and one captive-raised male was weighed at 8.8 kg (19.4 lb) in 2020.
[7] [8] [9] Overall, it is likely the second largest-bodied species of rattlesnake, behind only its close cousin the eastern diamondback rattlesnake. It is also the second largest of North American venomous snakes (the bushmasters, which attain similar weights and greater total length, occur up as far as Nicaragua). [10] [11] [12]
Of the 6 venomous snake species native to N.C., 3 are rattlesnakes – pigmy, timber & Eastern diamondback. Each one is protected by the North Carolina Endangered Species Act.
Crotalus oreganus, commonly known as the Western rattlesnake or northern Pacific rattlesnake, [4] [5] is a venomous pit viper species found in western North America from the Baja California Peninsula to the southern interior of British Columbia.
The largest rattlesnake, the eastern diamondback, can measure up to 2.4 m (7.9 ft) in length. [4] Rattlesnakes are preyed upon by hawks, weasels, kingsnakes, and a variety of other species. Rattlesnakes are heavily preyed upon as neonates, while they are still weak and immature. Large numbers of rattlesnakes are killed by humans.
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C. horridus is the only rattlesnake species in most of the populous Northeastern United States and is second only to its relatives to the west, the prairie rattlesnake, as the most northerly distributed venomous snake in North America. [8] [9] There are no subspecies that are recognized as being valid. [10] [11]