As busy as a beaver

Someone who is extremely busy and has no time to waste.

To drink like a fishSomeone who drinks alcohol excessively; to be in the habit of drinking alcohol excessively.

Innocent as a lamb.Someone who is not corrupted or tainted with evil or unpleasant emotions.

be as quiet as a mouse

to be very quiet

Crooked as a dog's hind leg

Someone who is very dishonest is as crooked as a dog's hind leg.

Sly as a foxSomeone who is as sly as a fox is cunning and experienced and can get what they want, often in an underhand way

To act as a guinea pigIf someone is used as a guinea pig, new ideas or products are tested on them.

As scared as a rabbit

To be so frightened or surprised that you cannot move or think.

As gruff as a bearSomeone who is unsociable OR Someone who has a rough or soar voice

A Head of the pack

"To be on top", "to be superior" or "to be the best"