A study was conducted on the changes of glycerol, hemolymph proteins, glucogen and fat content of diapause and non-diapause pupae of Helicoverpa assulta.
To survive the cold, some insects enter a state called diapause, which is their version of hibernation, and will not become active again until warm weather returns.
There, these adult insects enter a kind of hibernation called diapause, thanks to hormones triggered by the shorter days and cooler temperatures of autumn.
These babies are usually pretty well-equipped for survival: Eggs and larvae can enter diapause just like adults can, and some get extra help from their doomed parents.