Who will tell me a joke?

Hens and cows are on the grass. The hen is laying eggs. Suddenly, the cow came running. The hen said, "Aunt Niu, you said that I don't have a good atmosphere and live in this world. I want nothing. Although I lay eggs every day, I just want to eat! Hey! Aunt Niu said, "Sister Chicken, why are you sighing? "Now, people's hearts have changed. I supply them with milk every day, and they don't call me mom! "