One of the largest snakes in the world, the green anaconda can reach impressive proportions -- over 30 feet (9.1 m) in length, 12 inches (30.5 cm) in diameter and more than 550 lbs (250 kg)! Unlike many animals, female anacondas are considerably larger than their male counterparts. Green anacondas are a dark olive-brown with large alternating black spots running down their backs and smaller oval spots with yellow centers along their sides. Their eyes and noses are perched on top of their large heads, allowing them to breathe and see their prey even when submerged in water. Green anacondas are members of the boa family and are a non-venomous snake. They use their teeth and powerful jaws to hold onto their prey while their extremely muscular bodies wrap around their catches to suffocate them or drag them underwater.