Now in digital format and available as an instant e-Download! One of the most remarkable of bats' abilities is their biological sonar system called "echolocation." To chase down flying insects and avoid collisions in the dark, bats emit high-frequency beeps and analyze the echoes that come bouncing back. This PowerPoint presentation explains how echolocation works and how bats use it so effectively. Includes audio examples of actual echolocation calls. Zip file Contents: - Presentation in Powerpoint format - Free built-in Powerpoint Viewer - Narration text [Word Format] for class hand-outs Note computer system spec's required: Minimum 1 Ghz processor, 512 Mb RAM. Windows XP, MAC [PowerPoint for MAC required]. After purchase, you will be given a download link. This link will be valid for 30 days. Not recommended for dial-up users [Zip file size:170 Mb]. Please note: If you have a dial-up connection, this download is NOT recommended due to the size. This e-download is not refundable.