What are the differences between anacondas and boa constrictors?

Anacondas and boa constrictors differ in size, habitat, and hunting strategies. Anacondas, especially green anacondas, are among the largest snakes in the world, stretching up to 9 meters (about 30 feet) and weighing as much as 250 kg (about 550 pounds). Boa constrictors, by comparison, are generally smaller, with most adults measuring about 3 meters (10 feet) in length, although some can reach about 5.5 meters (18 feet).

Anacondas are primarily aquatic and thrive in the waters of tropical South America. They are well-adapted to a life in water, with eyes and nasal slits positioned on top of their heads, which is ideal for staying nearly submerged while stalking prey. Boa constrictors are largely terrestrial and can be found in a variety of habitats, ranging from Argentina to northern Mexico across tropical rainforests, savannas, and scrublands. They are also known to climb trees in search of birds.

Both anacondas and boa constrictors are nonvenomous constrictors, killing their prey by coiling around it and cutting off blood flow, causing organ failure within seconds. Anacondas often hunt larger prey, such as caimans and capybaras, striking from the water with stealth and power. Boa constrictors tend to feed on a wider variety of birds and mammals and typically hunt on land.