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How do land snails protect themselves during drought or cold?
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Dormancy
Virginia big-eared bats (Corynorhinus townsendii virginianushibernating) are true hibernators, entering a state close to death for much of the winter.
To protect themselves during periods of drought or cold, land snails employ several physiological and behavioral adaptations to survive environmental stress:
- Shell Withdrawal and Sealing: Land snails retreat into their shells, withdrawing their soft head and foot. To prevent desiccation, they secrete a protective membrane known as an epiphragm across the shell aperture. This seal is composed of mucus and lime and can, in some arid-dwelling species, become as thick as the shell itself.12
- Dormancy: During unfavorable conditions, land snails enter a state of dormancy. When this occurs during the heat and dryness of summer, it is referred to as estivation. In colder regions, they undergo hibernation. Some species, such as those in the genus Sonorella, may remain dormant for years between rainfall events.1342
- Behavioral Adjustments: Many land snails primarily adapt to life on land through behavior, such as seeking out areas of high moisture or retreating into damp niches during short dry spells. Some species may also burrow into the soil for protection.2
Unlike snails, slugs protect themselves by boring into the ground and secreting a mucus mantle around their bodies.1