1、bird
Birds of a feather flock 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 deserves 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