1、bird
Birds of a feather flock¹ together.物以类聚

Fine feathers make fine birds.人要衣装，佛要金装

A little bird told me that you win the prize.消息灵通人士告诉我你得了奖。

He is an old bird and you can’t take him in 他是个老练的人，你骗不了他。

A bird in hand worth two in the bush.一鸟在手胜过双鸟在林。

The early bird gets the the worm.笨鸟先飞/捷足先登

Kill two birds with one stone.一举两得

2、dog
Love me ,love my dog.爱屋及乌

Beat the dog befote the lion.杀鸡骇猴

An old dog will learn no new tricks.老顽固学不了新事物。

A good dog deserves² a good bone.有功者受赏

cat- and- dog life.吵吵闹闹的生活

die like a dog.潦倒而死

dog days.三伏天

rain cat and dog.倾盆大雨

lead a dog’s life.过着潦倒的生活

treat someone like a dog.不把某人当人看

3、rat,cat,mouse
When the cat is away,the mice will play.山中无老虎，猴子称霸王

like a rat in a hole.瓮中之鳖

let the cat out of the bag.露马脚

as poor as a church mouse.一贫如洗

In public affairs he remained a mouse.在公事上他胆小如鼠。

A cat may look at a king.地位虽不同，人权应平等。

4、tiger,lion
His father is a great lion here.他父亲是这儿的一个名人。

The soldiers were tigers in fight.那些士兵英勇作战。

5、其他动物
dark horse.能力深藏不露的

put the cart before the horse.本末倒置

Have a wolf by the ears. 骑虎难下，进退两难

a big frog in the small pond小地方的大人物

parrot cry.人云亦云

fish in troubled watered.混水摸鱼/趁火打劫

a snake in the grass.阴险而伪善的朋友

a wolf in sheep’s clothing.伪装友善的人