Why do cats bring dead mice and birds into ur house?

I read a book about the cats, and it is very interesting about the cats.

Lovers bring chocolates, cats bring mice.Your mother thaught you to say thank you, didn’t you didn’t she? These are mice that they have hunted and killed by themselves. If our cat bring in the mortally wounded critters, this mean the cat is really love us. She not only is making sure you don’t starve, but she’s trying her best to make sure you understand how to feed yourself.

: )