During hibernation nothing. they fatten up with aphids before. Hibernation for insects is called diapuse and differs lightly from hibernation in some other animals in a few ways such as they do not grow during that period.
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They hibernate for as long as it is cold outside. Then, in the spring and summer they breed and lay anywhere from 20 to 1,000 eggs. A ladybug can live for up to two years.
During the winter, ladybugs hibernate in large clusters, usually in warm and insulated places.
They mate- a lot. And don't eat as many bugs as you'd like them to becasuse of it.