Now in digital format and available as an instant e-Download! From the thumb-sized Western pipistrelle to the giant Western mastiff with a two-foot wingspan, North American bats of all descriptions and sizes are depicted as they hunt insects, pollinate flowers and rear their young in this dramatic and informative PowerPoint presentation. The program features 79 spectacular images and an audio narrative. This PowerPoint presentation explains how echolocation works and how bats use it so effectively. 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.