beaver

beaver fur; a beaver hat.

We watch him beavering away at his painting.

Bridget beavered away to keep things running smoothly.

She’s been beavering away at her homework for hours.

Ask young Harry to do it—he’s still an eager beaver and wants to impress by his willingness.

Giardiasis (also known as beaver fever) is a disease caused by the flagellate protozoan Giardia lamblia (also Giardia intestinalis).