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Crotalus basiliscus, known as the Mexican west coast rattlesnake, [3] Mexican green rattler, and also by other names, [4] is a species of pit viper in the family Viperidae. The species is endemic to western Mexico .
Rattlesnakes receive their name from the rattle located at the end of their tails, which makes a loud rattling noise when vibrated that deters predators. [2] Rattlesnakes are the leading contributor to snakebite injuries in North America, but rarely bite unless provoked or threatened; if treated promptly, the bites are seldom fatal.
The genus Crotalus is ovoviviparous, giving birth to live young. [6] The basic lifecycle of many Nearctic species has been known for quite some time. Females at an age of 26 months undergo vitellogenesis as they enter their third hibernation, [13] mate the following spring, and give birth later in September or October. [3]: 516
Like other rattlesnakes, they have eyes with vertical pupils, and their tail has a rattle on it. The rattle is composed of keratin . Each time the snake sheds its skin, a new segment is added to the rattle, but the rattle is fragile and may break off, and the frequency of shedding can vary, so the snake's age cannot be determined by its length ...
A color band may be seen at the back of the eye. The prairie rattlesnake group carries the distinctive triangle-shaped head and pit sensory organs on either side of the head. A key characteristic that can help differentiate a prairie rattlesnake from other rattlesnakes is the presence of two internasals contacting the rostral. [9]
Like other pit viper species but unlike most snakes, rattlesnakes don't lay eggs. Instead, they give birth to live young. Eight is an average-size brood, with the number depending on the snake's ...
Crotalus helleri or Crotalus oreganus helleri, also known commonly as the Southern Pacific rattlesnake, [3] the black diamond rattlesnake, [4] and by several other common names, is a pit viper species [5] or subspecies [3] found in southwestern California and south into Baja California, Mexico, that is known for its regional variety of dangerous venom types.
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