Echolocation works by making bursts of sounds and listen to the echoes that bounce back to get information about the environment. Below are materials for practical exercises. Also check out Concepts and Evidence.
Clicking Exercises [pdf] [video]
Echolocation Exercises - Basics [pdf]
Echolocation Exercises - Advanced [pdf]
Videos illustrating clicking [video 1] [video 2] [video 3]
Sounds of clicks [sound 1] [sound 2] [sound 3]