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[3]: 516 In addition, species that occur further north, where weather is colder during much of the year and the feeding and growing season is short, may reproduce only every other year or less. Those found in central and southern Mexico or the tropics have reproductive cycles that correspond mostly with the rainy season. [3]: 519
Crotalus ehecatl is a large and heavy-bodied snake, with adults reaching lengths of up to 165.3 cm (approximately 65 inches). The body pattern consists of a series of dark, diamond-shaped blotches on a lighter background, which can vary from gray to brown.
The scientific name Crotalus is derived from the Greek κρόταλον, meaning "castanet". [5] The name Sistrurus is the Latinized form of the Greek word for "tail rattler" (Σείστρουρος, seistrouros ) and shares its root with the ancient Egyptian musical instrument the sistrum , a type of rattle.
Crotalus culminatus is found across much of southwestern Mexico, inhabiting a wide range of elevations from near sea level up to 2285 meters in the Sierra de Coalcomán.It can be found in arid environments, tropical scrub forests, savannas, and mesic forests, with rocky outcroppings being central to its habitat needs.
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 .
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Crotalus campbelli can be distinguished from other members of the C. triseriatus species group by the presence of intercanthals, an infrequently divided upper preocular, and a combination of other morphological characters. Males typically have 150–154 ventrals and 31–32 subcaudals, while females have 147–152 ventrals and 22–26 subcaudals.
Crotalus triseriatus occurs in pine-oak forest, boreal forest, coniferous forest and, bunchgrass grasslands. On Volcán Orizaba, it is found at very high altitudes. There, the snow line comes down to about 4,572 m (15,000 ft), while green plants can be found up to 4,573 m (15,003 ft): the species has been found within this zone.