These are English idioms based on animals or animal behaviour. You can also try this Animal Idioms Quiz
Click on any idiom for more information, including example sentences, notes and quizzes.
You can say "it's raining cats and dogs" if it's raining very hard.
You can say an insult or criticism is like water off a duck's back if it doesn't upset you.
You're a night owl if you like to stay up and do things late at night.
If someone's a queer fish, they are a bit strange and can sometimes behave in an unusual way.
If you have a whale of a time, you have a great time and really enjoy yourself.
A wolf in sheep's clothing is someone who seems to be a good person but is really a bad person.
A zebra crossing is a pedestrian crossing that is marked on the road with painted black and white stripes.
If you say a situation or an issue is a can of worms, you think that getting involved in it could lead to problems.
If chickens are coming home to roost, someone is suffering the unpleasant consequences of their bad actions in the past.
If someone drinks like a fish, they drink a lot of alcohol.
If someone has eyes like a hawk, they have very good eyesight and they notice everything.
If you kill two birds with one stone, you achieve two things with the one action.
If you let the cat out of the bag, you let someone know a secret.
You feel like a fish out of water if you're surrounded by people who are different to you, and it's making you feel a little uncomfortable.
If you're as quiet as a mouse, you're very quiet.
If you're as sick as a dog, you're very sick.
If you take the bull by the horns, you deal with a problem or a challenge in a direct and fearless way.
If you talk turkey, you discuss something seriously, usually to do with business or money.
You can say something is the lion's share if it's the biggest share or portion of something.
The rat race is the highly competitive and stressful world of work and business.