Rattlesnake

Rattlesnakes are venomous snakes that belong to the genera Crotalus and Sistrurus of the subfamily Crotalinae. These snakes live in many places, eating small animals like birds and rodents. They are known for the special rattle on the end of their tails, which makes a loud noise to scare away danger.

Rattlesnakes are important because they help control the numbers of small animals in their habitats. They very rarely bite unless they feel threatened. With quick help, bites from rattlesnakes are usually not deadly.

There are 36 known species of rattlesnakes, with between 65 and 70 subspecies. All of them live naturally in the Americas, from southern Canada all the way down to central Argentina. The biggest kind, the eastern diamondback, can grow up to about 2.4 meters long, which is almost 8 feet!

Etymology

The name Crotalus comes from an Ancient Greek word meaning "castanet." The name Sistrurus is a Latin version of a Greek word that means "tail rattler." It is related to an old Egyptian musical instrument called the sistrum, which was also a type of rattle.

Ecology

Rattlesnakes live in many places from southern Canada to central Argentina, mostly in dry areas. Most live in the American Southwest and Mexico. You can find them in rocky areas, prairies, marshes, deserts, and forests. They like it when the temperature is between 80 and 90 °F (27 and 32 °C).

Rattlesnakes eat small animals such as mice, rats, rabbits, squirrels, small birds, and other tiny animals. They wait for their prey or hunt in holes. They use their venom to help catch their food. After eating, they rest in a warm, safe place until they digest their meal.

Anatomy

Rattlesnakes have special organs that help them hunt at night. They have heat-sensing "pits" on their faces that can find warm-blooded animals, like birds and rodents, by feeling their heat. These pits work like a camera, catching infrared light to make a picture of what is around them. Rattlesnakes also have great vision, with eyes that can see in the dark and spot colors during the day. They need movement to see clearly.

Rattlesnakes have sharp fangs connected to venom glands that make strong venom. This venom helps them catch food by harming their prey and stopping blood from clotting. Each rattlesnake is born with fangs and venom, ready to hunt right away. Their rattles, made from hollow parts at the end of their tails, make a loud noise to warn other animals away. The rattle gets longer each time the snake sheds its skin, but the number of segments does not show the snake’s age.

Reproduction

Most rattlesnakes mate in summer or fall. Females leave a special trail, and males follow it to find them. Once a male finds a female, he may stay near her for several days.

Rattlesnakes are different from many other snakes because they give birth to live babies instead of laying eggs. The babies grow inside the mother before being born. Females can store semen for months, so they can mate in the fall and give birth in the spring. It takes several years for rattlesnakes to grow up, and females usually have babies only once every few years.

Main article: Sex pheromones
Main articles: Oviparous, Ovoviviparous
Further information: Ovaries, Oviducts

Hybridization

Many rattlesnake species can interbreed and create hybrids. For example, in southwestern New Mexico, the Mojave rattlesnake sometimes hybridizes with the Prairie rattlesnake.

These hybrids often have a lower body condition compared to either parent species.

Hybridization can change the venom's toxicity, making it harder to treat bites. Rattlesnakes have many different types of venom, and hybridization may be one reason for this variation.

Brumation

During cold winter months, some rattlesnake species enter a period of brumation. This is a kind of dormancy similar to hibernation. They often gather in large groups and stay together in underground dens or burrows. These burrows are sometimes shared with other animals like turtles, small mammals, and other types of snakes.

Rattlesnakes often return to the same den each year, traveling long distances to get there. Scientists aren't sure exactly how they find their way back, but it might involve following special smells or using clues from the landscape and the sun. Species that brumate for long periods usually have fewer babies than those that don't brumate as long. For example, female timber rattlesnakes in the Appalachian Mountains of New England have babies only every three years on average, while the lance-headed rattlesnake, which lives in warm Mexico, has babies every year. Rattlesnakes also aestivate, or stay inactive, during very hot or dry summer months, which is why they are rarely seen then.

Conservation status

Rattlesnakes like to live in natural areas and usually stay away from places where people live. They are sometimes harmed by changes to their homes and by people who want to remove them. Some kinds, like the timber rattlesnake, massasauga, and canebrake rattlesnake, are in danger in many U.S. states.

In places with a lot of traffic, many rattlesnakes are sadly killed by cars. Some stories say that rattlesnakes near busy roads don’t rattle much, but scientists say this isn’t true. These snakes just don’t rattle as often as people think, especially if they are used to seeing people around.

Safety and first aid

Rattlesnakes can sometimes bite people, especially if they feel threatened. Most bites happen to people who get too close or surprise the snake. It's important to stay calm and give the snake space. If a bite does happen, getting help quickly is very important.

When a rattlesnake bites, it can inject venom. The sooner a person gets treatment, the better. Symptoms might include swelling, pain, and feeling sick. Children might feel these effects more strongly. It's always best to avoid rattlesnakes and give them space to stay safe.

Main articles: Reflexively, Edema, Erythema, Nausea, Vomiting, Hemorrhaging, Perspiration, Heart failure

Antivenom

Antivenom, or antivenin, helps people and animals who have been bitten by pit vipers like rattlesnakes. To make antivenom, scientists collect venom from live rattlesnakes, such as the western diamondback (Crotalus atrox), eastern diamondback (Crotalus adamanteus), and South American rattlesnake (Crotalus durissis terrificus). This venom is given to animals like horses, goats, or sheep. Their bodies make special proteins called antibodies that fight the venom. These antibodies are taken from the animals’ blood and turned into medicine that doctors can give to people who have been bitten.

Sometimes, people can feel unwell when they receive antivenom because their bodies react to the animal proteins in the medicine. In the United States, many pets and farm animals are bitten by rattlesnakes each year. Dogs often get bitten on their front legs or head, while horses and cows can get bitten on their faces. If an animal is bitten, vets can use special antivenom to help them feel better.

In human culture

Spirituality

Aztec paintings, Central American temples, and the big burial mounds in the Southern United States often show rattlesnakes as important symbols. The Feathered Serpent of Mesoamerican religion had features of both the quetzal and rattlesnake. The Ancient Maya believed rattlesnakes were "vision serpents" that connected to another world. Rattlesnakes were also important in Aztec mythology and appeared in their art and buildings.

In traditional medicine

During the Lewis and Clark Expedition, an interpreter used parts of a rattlesnake's rattle to help with a birth. It is not certain if the rattle actually helped, but the idea was passed down through stories.

As food

Some people say rattlesnake tastes like chicken but is tougher. Others say it tastes like veal, frog, or even canned tuna. It can be cooked by barbecueing or frying.

Symbolism

During the Revolutionary War, the rattlesnake became a symbol for the American Colonials and appears on the Gadsden Flag. It is still used today by the United States military and in various political movements.