5 Venomous Snakes Found in Peru (2025)
What types of venomous snakes live in Peru?
Due to the variety of habitats in Peru, there are dozens of different snakes you might see. While many species are not harmful to humans, you must be careful because some types are INCREDIBLY venomous and highly dangerous. Some snakes can even cause death if the bite is not treated quickly.
In the article below, I have listed some of the most common venomous snakes you might encounter in Peru. For each species, you will find out how to identify that snake correctly, along with pictures and interesting facts!
*If you come across any of these species, PLEASE DO NOT DISTURB! Venomous snakes are dangerous animals and should be left alone. The more you agitate them, the more likely you could get bitten. DO NOT RELY ON THIS ARTICLE to correctly identify a snake that has recently bitten you. If you have recently been bitten, GO DIRECTLY to the nearest hospital to get help and to determine if the snake is venomous.*
5 Venomous Snakes in Peru:
#1. Eyelash Viper
- Bothriechis schlegelii
Also known as Eyelash Pit Viper, Eyelash Palm Viper, Schlegel’s Viper, Eyelash Lancehead, Eyelash Mountain Viper, Horned Palm Viper, Parrot Snake
Identifying Characteristics:
- Adults are generally 55-82 cm (22-32 in) long.
- Their heads are broad and triangular.
- Coloration depends on habitat. These include bright yellow, green, orange, or pink. You might also see dark speckles dotted all over the body.
Look for this small venomous snake in Peru in forests and woodlands.
The fancy-looking Eyelash Viper earned its name from the pair of modified scales above its eyes which resemble eyelashes. A myth tells of this viper winking at its victims after biting them. Of course, snakes don’t have eyelids, so they can’t actually wink!
Did you know that Eyelash Vipers are resourceful creatures? To hydrate, they drink the water droplets that gather on leaves. In addition, they use their tails to grab onto branches, positioning themselves to hunt rodents, lizards, and small birds at night.
Eyelash Vipers are generally docile but will strike in defense if threatened. They’re moderately venomous, and while there are no recorded human deaths, their bites can still be very painful. Be careful if you happen to find one!
#2. Fer-de-lance
- Bothrops atrox
Also known as Common Lancehead, Barba Amarilla
Identifying Characteristics:
- Adults can grow 75-125 cm (30-49 in) in length.
- Look for a series of trapezoids across the body.
- Coloration is usually olive, gray, or brown. They have light-colored bellies, commonly white or cream.
- These snakes have golden irises and black tongues.
The venomous Fer-de-lance is responsible for most of the snake bites in Peru.
So, it’s best to tread carefully if you find yourself in the Amazon region. While these snakes live primarily in dense forests, they also wander into coffee plantations when hunting.
As with other pit vipers, the Fer-de-lance has heat sensors below its eyes to track prey. They easily devour smaller prey like frogs and tarantulas. However, when it comes to larger prey, these snakes bite and then let go. The venom eventually kills the animal while the snake tracks it down to consume it.
This snake isn’t only dangerous to its prey, either. A bite from this venomous snake targets the circulatory system and can cause serious internal bleeding in humans. Interestingly, the younger snakes have faster-acting venom. Either way, you should seek medical attention quickly if you get bitten by this aggressive species.
#3. Mountain Keelback
- Helicops angulatus
Also known as Brown-banded Watersnake, Water Mapepire
Identifying Characteristics:
- Adults grow to a maximum length of 78 cm (31 inches).
- Their eyes and nostrils are situated at the top of their heads.
- These snakes tend to be olive or grayish brown. Dark, jagged bands cover their bodies.
The Mountain Keelback is one of the slowest venomous snakes in Peru!
These sluggish travelers only move about a few meters each day. If you want to find one in action (or non-action, because of their slow speed), look in the freshwater bodies of the Amazon basin.
Because of its slow-moving nature, this species prefers to ambush unsuspecting prey. At night, Mountain Keelbacks lie in wait for unlucky animals swimming by. Smaller fish, frogs, and tadpoles are all on the menu. However, sometimes they are the unlucky ones as they are common prey for herons and larger snakes.
Mountain Keelbacks are only mildly venomous. However, they can be very irritable when disturbed. In defense, they will coil into an S position before lunging into a bite. They can’t kill you, but their bites are still quite painful. Hands off!
#4. Neotropical Rattlesnake
- Crotalus durissus
Also known as South American Rattlesnake, Central American Rattlesnake, Cascabel Rattlesnake, Guiana Rattlesnake, Aruba Island Rattlesnake
Identifying Characteristics:
- Adults are typically 150 cm (59 in) long on average.
- There is a prominent stripe at the base of their heads, intersecting each eye.
- Scales protrude from their body.
- They usually appear in shades of brown and gray. Sometimes, patterns of diamonds and triangles form across the body. Bellies are yellowish or white.
Neotropical Rattlesnakes in Peru are residents of grasslands and tropical forests.
You might also find them in drier areas if a shortage of prey drives them to find food. These snakes are most active at dusk, stalking rodents and other reptiles. They’re equipped with heat-sensing pits below their eyes to track down prey.
These rattlesnakes are dangerously venomous. Left untreated, bite victims can experience muscle paralysis and difficulty breathing. In the worst cases, victims can end up with organ failure and death. Therefore, if you receive a bite from a Neotropical Rattlesnake, it’s vital to get medical help as soon as possible.
A Neotropical Rattlesnake can move with remarkable speed, but its first instinct is not to attack. To warn you, it might make a rattling sound with its tail or raise its forebody into a defensive striking posture. When this happens, it’s best to respect the warning, back away slowly, and then leave the area.
#5. South American Bushmaster
- Lachesis muta
Also known as Atlantic Forest Bushmaster, Mapepire Zanana
Identifying Characteristics:
- Adults are 200-250 cm (79-98 in) long.
- They have broad heads.
- Their coloring can be yellowish, tan, or gray-brown.
- Look out for a scaly diamond pattern and a pale-colored underside.
True to its name, the South American Bushmaster loves to hide in the bushes and undergrowth of forests with frequent rain. This stealthy snake lurks near animal trails, waiting to ambush rodents, birds, and other smaller reptiles.
Bushmasters are solitary creatures. In fact, they are so elusive that herpetologists are still arguing about how dangerous they are. When they’re not hunting, these pit vipers rest in hollow logs and small burrows. So, don’t go peeking inside unless you’re prepared to come across one!
Loud rustling among fallen leaves can indicate the presence of a South American Bushmaster. They usually try to escape if disturbed but stay cautious nonetheless! Most researchers agree that they’re highly venomous. Untreated bites are thought to be potent enough to kill.
Check out these guides to other animals found in Peru!
-
14 COMMON Snakes Found in Peru!
-
The 27 MOST Common Birds That Live in Peru!
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The 22 MOST Common SPIDERS Found in Peru!
Which of these venomous snakes have you seen before in Peru?
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