10 best animal idioms in English

source: Learn English with Let's Talk   2014年5月29日
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1. As busy as a beaver
Some one who is extremely busy and has no time to waste.
2. To drink like a fish
Someone who drinks alcohol excessively; to be in the habit of drinking alcohol excessively.
3. Innocent as a lamb.
Someone who is not corrupted or tainted with evil or unpleasant emotions.
4. be as quiet as a mouse
to be very quiet
5. Crooked as a dog's hind leg
Someone who is very dishonest is as crooked as a dog's hind leg.
6. Sly as a fox
Someone who is as sly as a fox is cunning and experienced and can get what they want, often in an underhand way
7. To act as a guinea pig
if someone is used as a guinea pig, new ideas or products are tested on them.
8. As scared as a rabbit
to be so frightened or surprised that you cannot move or think.
9. As gruff as a bear
Someone who is unsociable OR Someone who has a rough or soar voice
10. A Head of the pack
"To be on top", "to be superior" or "to be the best