The smallest type of whale is the pygmy sperm whale (Kogia breviceps). Adult pygmy sperm whales typically measure around 2.7 to 3.4 meters (approximately 8.5 to 11 feet) in length and weigh between 250 to 400 kilograms (roughly 550 to 880 pounds). These whales are known for their compact size, rounded bodies, and unique appearance that includes a small head and large eyes. Pygmy sperm whales inhabit deep ocean waters and are elusive, often rarely seen by humans. Their diet primarily consists of squid and deep-sea fish, and they have the ability to dive to significant depths to hunt.