water rat

US /ˈwɑːtər ræt/
UK /ˈwɑːtər ræt/
"water rat" picture
1.

a large vole (Arvicola amphibius) that lives in or near water and has a short tail and small ears, native to Europe and Asia

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The water rat quickly dived into the river.
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We spotted a water rat building its burrow by the stream.
2.

a person who spends a lot of time in or on the water, especially swimming or boating

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He's a real water rat, always out on his kayak.
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The kids are such water rats; they spend all summer at the pool.
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aquaphileswimmerboater
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ratrat ondassie ratpack ratmole ratkangaroo ratbeaver rat