Sperm whales are the largest toothed whales. Adult males grow to be about 50-60 feet (17-20 m) long, weighing about 40-50 tons (36-45 tonnes). Females are smaller, about 33-40 feet (11-13 m) long, weighing about 14-18 tons. The four-chambered heart of the average sperm whale weighs about 277 pounds (126 kg), Sperm whales have the largest head of any animal. It can be about 20 feet long (6 m), 10 feet high (3 m), and 7 feet (2.1 m) across, and is about one-third of the whale's body length. The head has a distinctive box-like shape. The heads are frequently covered with circular scars that are made by the suckers of the giant squid that they hunt and eat.
6 inches long
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