Rakali — Australian water rats
These little mammals are found in most parts of Australia but they're shy, so I've never seen one in real life.
I'd never even heard of them until I read about people catching them by accident in nets. Needless to say, that's illegal. I look forward to seeing one in real life one day.
In Wipptee, a cozy mystery / rural romance, the heroine Maddie envies rakali because they live in peaceful quiet waters while she is buffeted in rough waters.