The ladybug may range in size from 0.8mm to 18mm. Ladybugs can also be called ladybirds, as well as by their scientific name: Coccinellidae.The life of a ladybug (from egg to adult) takes about four to eight weeks. They will live for two to three years. They can live in shrubs, trees, fields, gardens and sometimes in homes.They will eat most plant-eating insects, which will, (when they grow), protect the crops.