Prairie Rattlesnake

Prairie Rattlesnake

Western rattlesnake, Great Plains rattlesnake, Hopi rattlesnake, Great plains rattlesnake

Kingdom
Phylum
Subphylum
Class
Order
Suborder
Family
Genus
SPECIES
Crotalus viridis
Population size
Unknown
Life Span
16-24 years
Weight
227-361
8-12.7
goz
g oz 
Length
100-151
39.4-59.4
cminch
cm inch 

The Prairie rattlesnake (Crotalus viridis) is a venomous pit viper species native to North America. Currently, two subspecies are recognized, including the Prairie rattlesnake, the nominate subspecies, and the Hopi rattlesnake.

Appearance

These snakes are usually lightly colored in hues of brown. Patches of dark brown are often distributed in a dorsal pattern. A color band may be seen at the back of the eye. The western 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 western rattlesnake from other rattlesnakes is the presence of two internasals contacting the rostral.

Video

Distribution

Geography

Prairie rattlesnakes are found over much of the Great Plains, the eastern foothills, and some intermontane valleys of the Rocky Mountains, from southwestern Canada through the United States to northern Mexico. In Canada, they occur in Alberta and Saskatchewan; in the US in eastern Oregon, eastern Washington, southern Idaho, most of Montana, North Dakota, South Dakota, Wyoming, Nebraska, Colorado, Kansas, Oklahoma, Texas, New Mexico, extreme eastern Arizona, extreme western Iowa, and in Mexico in northern Coahuila and northwestern Chihuahua. Prairie rattlesnakes inhabit forests, shrubland, grassland, prairies, and desert areas. They generally occupy areas with an abundant prey base. Many subspecies occupy somewhat rocky areas with outcrops serving as den sites. Prairie rattlesnakes seem to prefer dry areas with moderate vegetation coverage.

Prairie Rattlesnake habitat map

Climate zones

Prairie Rattlesnake habitat map

Habits and Lifestyle

Prairie rattlesnakes live on the land, but they can sometimes climb in trees or bushes. Some even rest in crevices or caves and may occupy burrows of other animals. They are typically active diurnally in cooler weather and nocturnally during hot weather. Prairie rattlesnakes have poor eyesight and in order to find prey, they use their heat-sensitive pits or their forked tongue that picks up airborne scents. These snakes generally live alone but hibernate communally during cold winter months. They are not considered to be very aggressive but will defend themselves if threatened or injured. As with other rattlesnake species, Prairie rattlesnakes will rapidly vibrate their tails, which produces a unique rasping sound to warn intruders.

Seasonal behavior

Venom

The venom of the Prairie rattlesnake is a complexly structured mixture of different proteins with enzymes such as proteases and peptidases found among them. Besides the hemotoxin and its tissue-destructive effect, the venom also has neurotoxic properties.

Diet and Nutrition

Prairie rattlesnakes are carnivores and prefer to prey on small mammals, such as ground squirrels, ground-nesting birds, mice, rats, small rabbits, and prairie dogs. They will occasionally feed on amphibians and reptiles, and sometimes even other snakes.

Mating Habits

PREGNANCY DURATION
3 to 4 month
BABY CARRYING
1-25 young
INDEPENDENT AGE
at birth
FEMALE NAME
female
MALE NAME
male
BABY NAME
snakelet

Prairie rattlesnakes are viviparous reptiles which means they give birth to live young. During the mating season, males may compete for females but females may not necessarily breed every year. Females give birth from 1 to 25 young, usually in late summer or early fall. The young are born fully developed and are 22-28 cm long. They do need parental care and reach reproductive maturity at three years of age.

Population

Population threats

There are no major threats to Prairie rattlesnakes at present. However, locally they may suffer from habitat loss for agricultural uses, human persecution, and road mortality.

Population number

According to IUCN, the Prairie rattlesnake is locally common and widespread throughout its range but no overall population estimate is available. Currently, this species is classified as Least Concern (LC) on the IUCN Red List and its numbers today are stable.

Ecological niche

Prairie rattlesnakes are important predators of many small rodents, such as rats and mice, which make up a big portion of their diet and thus control their populations.

Coloring Pages

References

1. Prairie Rattlesnake on Wikipedia - https://en.wikipedia.org/wiki/Crotalus_viridis
2. Prairie Rattlesnake on The IUCN Red List site - https://www.iucnredlist.org/species/64339/12771847

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