Western Diamondback Rattler Picture

Unwelcome Uninvited Visitor - Crotalus atrox

This young diamondback, considered more dangerous as they don't have as much control of their venom flow as older larger rattlers do, is about 30 inches (.76m) in length. That slight indentation toward the tail is the drip line of my bedroom patio roof. Way too close for comfort. I see anywhere from one or two up to ten a year anytime of year including the dead of winter! Unless they are an imminent threat to me or my animals, I have the fire department come and get them for relocation within a mile radius. They cannot survive in an area unknown to them. As they are a vital and necessary part of the ecology, particularly rodent control, they should never be killed just because they are venomous. I've both had one come at me aggressively and had one I startled "run" away rattling like crazy as it went. When a rattler "runs", it is quite fast (about 5.5mph - 9.2kmp) and holds itself in an S shape with only 1/3-1/2 of the back part of the body on the ground. Most would simply like to get away and avoid a human since we are much too big to be prey.

"The Western Diamondback Rattlesnake, or Crotalus atrox, a member of the family Viperidae, the subfamily Crotalinae, and the genus Crotalus, has such a hold on the human psyche that it has been a symbol of the American Southwest from prehistoric into historic times. It figures in ancient mythology, ceramics and rock art and in modern story and media.

The Western Diamondback, which can exceed seven feet in length, is the king of the twenty odd species and sub-species of Southwestern desert rattlers, not only in terms of size, but also in terms of its fearsome reputation.

Malevolently handsome, its basic color ranges from brown to gray to pinkish, depending on the shade of its habitat. Its back is lined with dark diamond-shaped blotches outlined by lighter-colored scales. Its head is distinguished by two dark stripes, one on each side of its face, which run diagonally, like Zorro’s mask, from its eyes back to its jaws. Its tail is circled by several alternating black and white bands, like the pattern of a raccoon’s tail. Its patterns are most distinctive when the snake is young and are more faded, blurred and camouflaged when it is older.

Like its brethren – a clan of some 100 species of poisonous snakes generally called "pit vipers" – the Western Diamondback comes equipped with a spade-shaped head, a fiendish fang and venom system, elliptical pupils and heat-sensing facial pits. It has reserve fangs to replace any which break off in a victim. Like shark's teeth, the fangs are continually replaced, with new fangs moving into position about every 60 days. The venom causes extensive tissue damage, bleeding and swelling in humans. The pits, in effect, infrared detectors, guide the snake swiftly and surely to warm blooded prey such as rodents, even in the total darkness of the animals’ burrows. Its rattles – a distinguishing feature it shares only with other rattlesnakes – grows segment by segment, each rattle the keratin remnant of a shed skin. It can add two or three rattles each year, with each molt, although it may also break off some of its rattles in the course of a year.

The Western Diamondback will coil, rattle fearsomely, and stand its ground when threatened. It bites hundreds of people a year, more than any other venomous snake in the United States. It hunts from late evening to early morning, crawling either sinuously like other snakes or rectilinearly like a caterpillar." From start to finish, a strike takes less than .5 of a second, faster than the human eye can see, and often takes only .12-.23 of a second.

"Like other rattlers, the Western Diamondback takes up residence among communities of small mammals such as prairie dogs, rabbits, gophers, chipmunks, ground squirrels, mice and rats, the more the better, usually hunting at night. It ambushes victims along their trails or attacks them in their burrows, sometimes striking and swallowing an animal which weighs more than the snake itself. Given the opportunity, the snake will also eat birds. After feeding, the snake can go several weeks before feeding again.

The Western Diamondback, especially the juvenile, often comes under attack itself. It may become a meal for an eagle, a hawk, a roadrunner or a wild turkey; for a kingsnake or a whipsnake; or for a coyote, a fox, a badger or a feral hog. Regarded as an enemy and a threat, it may be trampled to death by a deer, an antelope, a cow, a horse or even a sheep. The Western Diamondback lives in a rough neighborhood.

The snake occupies diverse habitats from sea level to 7000 feet, ranging from desert flats to rocky hillsides, grassy plains, forested areas, river bottoms and coastal prairies. (Yes, the snake can swim quite nicely, holding its rattles above the water to keep them dry.) Its range spans much of Arkansas, most of Texas and Oklahoma, the southern parts of New Mexico and Arizona, the southern tip of California, and the northern parts of Mexico’s Chihuahua and Sonora.

The Western Diamondback male, like the males of most species, become obsessed with females at mating time, in the spring. He pursues the female incessantly. Should he encounter another male, the two will wrap around each other in a serpentine wrestling contest, rearing and falling and body slamming until one or the other concedes defeat. Once inseminated, the female, sexually mature at three years old, will bear her brood live, in late summer. The young are born complete with fangs and venom, armed and dangerous at birth. The mother abandons them upon delivery.

With the coming of the shortening days and falling temperatures of autumn, the Western Diamondbacks head for the community den – a cave or rocky recess – where they will hibernate for the winter. In colder areas, they come by the hundreds; in warmer areas, by the dozens. They emerge in spring, sexually driven, hungry and mean."

(Most Text © DesertUSA.com 2010 - some editing done by me)

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