L1 - Nature and the environment
L1 - Science and Technology
L1 - Art and Culture
L1 - Leisure and Entertainment
L1 - School and Family
L1 - People and Work
L1 - Sport and Health
L1 - Travel and Transport
L2 - Nature and the Environment
L2 - Science and Technology
L2 - Art and Culture
L2 - Leisure and Entertainment
L2 - School and Family
L2 - People and Work
L2 - Sports and Health
L2 - Travel and Transport
L3 - Nature and the Environment
L3 - Science and Technology
L3 - Art and Culture
L3 - Leisure and Entertainment
L3 - School and Family
L3 - People and Work
L3 - Sports and Health
L3 - Travel and Transport
L4 - Nature and the Environment
L4 - Science and Technology
L4 - Art and Culture
L4 - Leisure and Entertainment
L4 - School and Family
L4 - People and Work
L4 - Sports and Health
L4 - Travel and Transport

Unit 1: Hibernation

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Unit 1: Hibernation

W: Some animals in cold climates hibernate. This means that they spend the winter months in a very long and deep sleep. Many animals find shelter underground. They dig out shelters to sleep in. Animals that cannot dig find cracks or holes at the base of trees and bushes. If they like the place they find, they might use it for years and years.

Animals that hibernate include cold-blooded animals, such as lizards, frogs, and snakes. Many warm-blooded animals also hibernate, such as mice, bats, and squirrels. When these animals are hibernating, they seem like they are not alive at all. Warm-blooded animals seem colder to the touch. However, their blood is still very warm. Hibernating animals have a very slow heartbeat. They almost stop breathing. Extra blood sugar and fat in their bodies keep them alive. They eat lots of food just before they hibernate.

Winters that do not stay cold are dangerous for hibernating animals. They can sometimes wake up in their shelters when it gets a little warm. Then they use energy by moving around. During winter, there is very little food. These animals can get very thin and weak. If they move around too much and do not eat, they can die.

Animals hibernate to escape the cold. There are also animals in hot climates that escape the heat. During very hot or dry weather, they sleep underground. This is called aestivation.