What characteristic that helps an animal survive?

An adaptation is a characteristic that helps an animal survive in its environment. Adaptations can be physical, behavioural, or physiological.

Physical adaptations are changes in an animal's body that help it to survive. For example, animals that live in cold climates may have thick fur to keep them warm, while animals that live in hot climates may have large ears to help them cool down.

Behavioural adaptations are changes in an animal's behaviour that help it to survive. For example, animals that live in groups may be able to defend themselves against predators more effectively than animals that live alone.

Physiological adaptations are changes in an animal's body chemistry or physiology that help it to survive. For example, animals that live at high altitudes may be able to tolerate lower levels of oxygen than animals that live at sea level.

Adaptations are an important part of evolution. They allow animals to survive in new and changing environments, and they can eventually lead to the formation of new species.