There are more than 5000 ladybird species. Ladybirds usually eat plant lice. However, Asian species when introduced to the Europe attacked European ladybirds. Dots on the ladybirds have nothing to do with the years of living. Some ladybirds have up to 22 dots on the back. Average lifespan of these cute bugs is three years. Some people believe that ladybirds can predict the weather. If they fell off your hand it would rain, if they flew away it would be fine.