Final answer:
In summer, animals commonly use aestivation as a type of dormancy to survive hot and dry periods.
Step-by-step explanation:
In summer, the type of dormancy commonly used by animals is aestivation. Aestivation is a type of dormancy that some animals enter during hot, dry periods to survive hostile temperatures. During aestivation, their metabolisms slow down, their bodies retain water, and they shift to altered nitrogen metabolism to conserve energy. This enables the animals to wait until the environment better supports their survival.