The blue whale (Balaenoptera musculus) is the largest known animal on Earth, with a maximum recorded length of 108 feet (33 meters) and a weight of up to 400,000 pounds (181,437 kilograms). The colossal squid (Mesonychoteuthis hamiltoni) is the largest known invertebrate, with a maximum recorded length of 46 feet (14 meters) and a weight of up to 2,200 pounds (1,000 kilograms).