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Hermit Elephant
From Discworld & Pratchett Wiki
The Hermit Elephant (Elephantus Solitarius) is a species native to Howondaland. The Hermit Elephant has thin skin making another form of protection necessary; it enters a village and lifts a building onto its back to use as a shell. As the elephant grows larger it will require bigger and bigger houses. The Hermit Elephant is similar in this way to the Roundworld hermit crab.