Anaconda

Oddly, the word anaconda was first used for a snake from Sri Lanka, not South America. The English naturalist John Ray described an anacandaia from Ceylon in 1693, and the name later moved to the giant water boas of the Amazon. Its origin is uncertain: one theory links it to the Tamil anai kondra, elephant killer, and another to the Sinhalese henakandaya, a name for a small whip snake. In South America the anaconda has its own local names, such as sucuri in Brazil, güío in the Llanos of Venezuela and Colombia and huille in Trinidad.

Sometimes, yes. Researchers studying anacondas in the Llanos of Venezuela have documented several cases of large females eating males during the breeding season, and in Brazil a female was photographed killing a male after mating. It is not the rule, but it makes sense: a pregnant female barely eats for six or seven months, and a male, much smaller than her, is a large meal that is already within reach. For the male the risk is part of the cost of breeding with a partner that can be five times his weight.

In the wild a green anaconda lives about ten years on average, although large females can live longer. Young anacondas face many predators, and adults die from hunting, road traffic, droughts that dry out their pools and the effort of breeding. In captivity, with regular food and no predators, anacondas often pass 20 years and some have lived close to 30. Females grow throughout their lives, so the biggest anacondas are always old females.

An adult female anaconda has very few enemies, but young ones are vulnerable. Newborns of less than a meter are eaten by caimans, large birds of prey, herons and predatory fish, and even by other anacondas. Jaguars hunt anacondas of all sizes, including large adults, when they find them on land or in shallow water. Today, however, the main threat to adults is people, who kill them out of fear or for their skin.

An anaconda can hold its breath for about ten minutes, and longer when it is resting and not moving. Its eyes and nostrils sit on top of its head, so it can breathe and watch for prey while almost all its body stays hidden under the surface. The nostrils close with special flaps when it dives. This is why anacondas are so hard to spot: a five meter snake can lie in a pool with only a few centimeters of its head showing.

The anaconda is an ambush predator that waits motionless in shallow water until prey comes within range. It strikes with speed and wraps its coils tightly around the animal, restricting blood flow until the heart stops. Death occurs by cardiac arrest, not suffocation as is commonly believed. After the prey is dead, the anaconda swallows it whole, head first. Following a large meal it may go weeks or even months without eating again while digestion is completed.

No. The anaconda is viviparous, meaning it gives birth to live young rather than laying eggs. This is unusual among large constrictors. Females can produce litters of 20 to 40 offspring at a time, with larger females in good condition tending to have bigger litters. The young are born fully formed and independent, capable of hunting from the moment they emerge. The breeding season involves multiple males pursuing a single female, sometimes forming a tangled group that can last for weeks.

Anacondas and pythons are both large constrictors but belong to different snake families and live on different continents. Anacondas are native to South America and belong to the boa family. Pythons are found in Africa, Asia, and Australia. The green anaconda is the heaviest snake in the world, while the reticulated python of Southeast Asia holds the record for length. Both kill by constriction, but anacondas are more closely tied to water and spend much of their lives submerged.