There are about 5, 000 different kinds of ladybugs(瓢虫) in the world. They come in many different colours. Their bright colours warn other animals or insects not to eat them. Ladybugsbad. A bird or a frog that eats a ladybug will remember the bright colours and it will not eat another ladybug with the sameagain. When ladybugs are, they will give out a fluid( 液体) that tastes terrible.

   In many cultures, the ladybug is considered to be a symbol of good luck. Most ladybugs are  to humans. They eat other insects which destroy crops. One ladybug can eat up to 5,000 insects in its lifetime.