Sperm whales have conical teeth on their long, narrow, lower jaw. The teeth fit neatly into sockets in the upper jaw, which has no teeth. This arrangement is a perfect adaptation for slurping up soft-bodied squids—giant or otherwise. The sperm whale is listed as Vulnerable on the IUCN's Red List of Threatened Species.
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Inside a Sperm Whale's Mouth
![Photo taken of the inside of a sperm whale's mouth. The teeth on the lower jaw fit into sockets above- perfect for eating squid.](/sites/default/files/styles/3_2_large/public/2023-11/D1000017-full_1.jpg.webp?itok=mOak9CU8)