Animals

1.A little bird told me
If someone doesn't want to say where they got some information from, they can say that a little bird told them.
2.As the crow flies
This idiom is used to describe the shortest possible distance between two places.
3.Bear market

A bear market is a period when investors are pessimistic and expect financial losses so are more likely to sell than to buy shares.
4.Back the wrong horse
If you back the wrong horse, you give your support to the losing side in something.
5.Bee in your bonnet
If someone is very excited about something, they have a bee in their bonnet.
6.Big fish in a small pond
A big fish in a small pond is an important person in a small place or organisation.
7.Bigger fish to fry
If you aren't interested in something because it isn't important to you and there are more important things for you to do, you have bigger fish to fry.
8.Blind as a bat
If you are in total darkness and can't see anything at all, you are as blind as a bat.
9.Cat among the pigeons
If something or someone puts, or sets or lets, the cat among the pigeons, they create a disturbance and cause trouble.
10.Cat and dog life
If people lead a cat and dog life, they are always arguing.