The twig snakes, belonging to the genus Thelotornis, are also commonly known as bird snakes or vine snakes. These rear-fanged venomous snakes are part of the family Colubridae and are native to Africa. They are masters of disguise, blending seamlessly into their surroundings through patterns and textures.
Thelotornis capensis head
Appearance and Identification
All species in the genus have a slender and elongated profile, a long tail, a narrow head, and a pointed snout. The African twig snakes are distinctive in appearance and unlikely on that continent to be mistaken for any other snake, if indeed the observer notices them. Thelotornis is characterised by a depressed and flat head, keyhole-shaped pupils, and in T. kirtlandii, a projecting canthus rostralis which forms a shallow loreal groove on each side of the head, which allows some binocular vision. In appearance, the head at least is unlikely to be mistaken for any other African snake. Other characteristics include a very long tail and large back fangs.
Twig snakes are greyish-brown with faint light and dark markings. The colors of a twig snake’s scales are gray and brown. Its underside is a combination of gray and pink. When threatened, they inflate the throat to display bold black markings between the scales.
The eye of all species has a horizontal pupil, shaped like a keyhole, which gives twig snakes binocular vision. In fact, its pupils are one of its most distinctive features. Studying its pupil shape can definitely help with the proper identification of this reptile. Another one of this snake’s most distinctive features that can help with identification is its bright red tongue.
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Size
Twig snakes can grow to a length of 48 inches (four feet). In addition to its tremendous length, its body is very slim which is why it is called a twig or vine snake.
Habitat and Distribution
The twig snake is found in the southern part of Africa. No. Twig snakes are native to the southern part of Africa. Specifically, in Namibia, Zambia, Mozambique, and Zimbabwe. This snake lives in a forest or savanna habitat where it’s able to blend in with tree branches, bushes, and shrubs.
Distribution area in Africa
Behavior and Diet
Twig snakes are experts at hanging out among branches, using their camouflage to become nearly invisible. They can stay perfectly still for hours, waiting for prey to come close! These snakes have a special way of catching their prey. They strike swiftly, but they also rely on their sneakiness, waiting patiently until the perfect moment to pounce!
Their main prey consists of smaller animals such as small birds, frogs, and lizards. They also feed on rodents and, rarely, small snakes as well. The diet of the bird snake does include birds. However, birds are not their main source of sustenance. Using their camouflage, they ambush their prey with a quick and deliberate bite. After their venom subdues their prey, the snake will swallow it whole.
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Twig snakes have a unique way of moving through branches. Their slender bodies allow them to slither quietly without making a sound, like a stealthy superhero of the forest! Sometimes this vine-like snake hangs upside down from a branch to capture its prey. After injecting the animal with venom, the twig snake remains upside down, swallowing its prey.
When threatened, twig snakes often freeze and remain motionless, looking just like a stick. This clever trick often confuses predators and helps them stay safe! These snakes can flatten their bodies to fit into narrow spaces, making it easier to blend in with their surroundings. They have become real-life ninjas in the animal world!
Usually solitary, twig snakes may occasionally group together in tree branches. It's like a secret club where they all stay hidden from hungry birds searching for dinner!
Twig snakes can change their behavior based on the temperature. If it gets too hot, they find shady spots to cool down, showing us how clever they are at managing their environment!
When it comes to mating, male twig snakes may engage in playful (and sometimes wiggly) displays to impress females. It’s like their own little dance party in the trees!
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Their skin shines in the sunlight, making them look even more twig-like. This glossy appearance makes it harder for predators to spot them, adding an extra dash of stealth!
The camouflage that helps them ambush prey also helps them hide from predators. Like most snake species, their biggest threat comes from birds of prey such as hawks or eagles.
If you happen to stumble upon a twig snake, you might think you just saw a stick move!
What Is a Twig Snake?
Venom and Its Effects
The bird snake is extremely venomous. Twig snakes are among the few rear-fanged colubrids whose bite is highly venomous and potentially fatal. Its venom is categorized as hemotoxic.
Twig snake bites are potentially deadly: the venom is hemotoxic, affecting the blood clotting mechanism and causing uncontrolled bleeding and internal hemorrhaging. The venom is hemotoxic, and although its effects are very slow, and bites are rare, no antivenom has been developed and several fatalities (such as Robert Mertens) have occurred.
A bite from this snake is rare. This is true for a couple of reasons. For one, these snakes are shy with a mild temperament. They stay hidden most of the time which is easy for them. Their grayish/brown scales serve as excellent camouflage in their woodland or savanna habitat. So, chances are you wouldn’t see a twig snake even if you were near one. Second, they are not aggressive unless they feel threatened. When this snake feels threatened it inflates its neck to make it appear larger in size. It does this in an effort to scare predators away.
Twig snakes are typically considered low risk. Normally, they only bite humans when provoked or handled improperly. In the wild, they are shy and will hide away from humans rather than approach. This is because of their fang structure. Twig snakes have a rear-fanged structure, which means that their fangs are located in the back of the mouth rather than the front. Because of this, the snakes must bite deeply and chew on their prey to inject venom.
If you do happen to be bitten by a twig snake aka vine snake, medical attention is necessary due to its potentially deadly venom. Keep the area where you were bitten lower than the level of your heart.
Most humans won’t encounter the venomous bird snake. In addition, this snake is timid and its colors help it to hide in its branch-filled habitat.
The amount of venom injected through a bite can vary. In fact, sometimes snakes give what are known as dry bites. These are bites containing no venom. Dry bites are used by many snakes as another warning to predators to go away. Sometimes the symptoms resulting from a vine snake bite don’t appear for 24 to 48 hours.
While the venom is extremely dangerous, fatalities are very rare. Symptoms include bleeding from the nose or mucous membranes, as well as bruising.
Taxonomy and Subspecies
Thelotornis capensis is the scientific name of the twig snake. It’s also known as a bird snake and forest vine snake. Three subspecies of T. Thelotornis capensis capensis A.
| Feature | Description |
|---|---|
| Scientific Name | Thelotornis capensis |
| Other Names | Bird snake, forest vine snake |
| Habitat | Forest, savanna |
| Distribution | Southern Africa (Namibia, Zambia, Mozambique, Zimbabwe) |
| Venom | Hemotoxic |
| Diet | Small birds, frogs, lizards, rodents, occasionally small snakes |
| Lifespan | 8-12 years |
