1. To use sound waves for orientation, as bats do.
1. A sound or series of sounds caused by the reflection of sound waves from a surface.
2. To spend the winter in a dormant state, conserving energy.
3. The action of moving silently and secretly to avoid detection.
4. To move through the air using wings.
5. A blood-sucking creature often associated with bats in folklore.
6. Lacking the sense of sight.
7. A small invertebrate animal typically having a segmented body and six legs.
8. A large underground chamber or series of chambers.
9. An animal that hunts and kills other animals for food.
10. A system used by bats to navigate and communicate by emitting and detecting sound waves.
11. A system that uses radio waves to detect and locate objects.
11. A place where bats rest or sleep during the day.
12. A large and sumptuous meal, typically in celebration of something.
12. The soft, thick hair that covers the body of a mammal.
13. The possibility of harm or injury.
14. The facial part that protrudes above the mouth used for smelling.
15. To move slowly on hands and knees.
16. Moving or capable of moving quickly.
17. The period of darkness between sunset and sunrise.
18. The modified forelimb of a bat used for flying.
19. A long, sharp tooth, especially of a venomous snake or spider.
20. To be suspended or attached to something above.
21. To move from one region to another, often with the change in seasons.