How sound waves are reflected
When a sound wave hits a surface that it is unable to pass through, it can reflect, which also creates an echo. Some animals, such as bats and dolphins, use echolocation, which is the use of reflected sound waves to determine distances or to locate objects. Also, a system called sonar is often used, and that system uses reflected sound waves to detect and locate objects under water.
What are some examples of animals that use echolocation?