if something is for the birds(不重要的,无价值的), it is worthless or not very interesting.
Did you know that if you tell a young person about the birds and bees(基本的性知识), you're explaining about sex and birth?
Have you ever observed that birds of a feather flock together(鸟以群分,物以类聚)? In other words, people who are similar become friends or do things together
A bird in a hand is worth two in the bush(一鸟在手,胜于二鸟在林).
This is a real feather in my cap(可引以自豪的成就等). It is something to be proud of.
She is not very young; she is no spring chicken(尤指女子,已不年轻);
she will work any job for chicken feed(少量,尤指钱)-a small amount of money
Often she will chicken out(害怕); she will not go out alone at night
My sister was an ugly duckling(丑小鸭，年幼时不好看长大后才貌出众的人). She looks strange when she was a child but she grew up to be a beautiful woman.
Criticism falls off her like water off a duck's back(批评对某人不起作用).
Sometimes she thinks too much about having something in the future before she really has it. She counts her chickens before t
hey are hatched(小鸡还没孵出来,先计算鸡数:打如意算盘).
Sometimes her chickens come home to roost(言语等，应验到说出者本人身上). That means her actions or words cause trouble for her
