The anaconda is the largest snake in the world judging by weight, though the Asiatic reticulated python is longer. Anacondas can grow up to 29 feet (9 meters) long, weigh up to 550 pounds (250 kilograms), and measure 12 inches (30 centimeters) in diameter. This large girth means that anacondas can eat large prey like tapirs, deer, sheep, and dogsand occasionally jaguars or humansin addition to smaller prey. It kills its prey by wrapping around them and squeezing, suffocating them.
Photograph courtesy of National Nuclear Security Administration