- Bats Northwest
 - An organisation devoted to the study and preservation of bats in the Pacific Northwest through conservation, education, and research. Site features institute profile, events, bat FAQs, site map, and web resources on bats. - Biosonar: Seeing With Sound
- Features bats and their sonar chirps as well as some dolphin sonar clicks. Also describes how biosonar works.
- Batcalls.org
- Designed to facilitate the sharing of bat sounds over the Internet.
- SonoBat
- Software for analyzing and comparing high-resolution full-spectrum sonograms of bat echolocation calls recorded from time-expansion bat detectors.
- Pacific Northwest Bat Call Library
- Designed to aid the assessment of bat echolocation call variation as well as to provided researchers with a central source of reference calls to use in future analyses.
- Bat Ecology and Bioacoustics Laboratory - University of Bristol
- Research group studying bats and bat ecology, including the reproductive and foraging behaviour of bats, how echolocation works, and habitat conservation. From the University of Bristol.
- South-eastern Australian Bat Call Library
- A central source of reference calls of south-eastern Australian bats for researchers and wildlife managers.
- BATCALL: Acoustic Call Library and Species Accounts
- Serves as distribution point for reference, research, and exchange of calls recorded from bats using the Anabat hardware and software.
- AnaBat Software
- Titley Electronics offers an overview of AnaBat software, a system designed to help users identify echolocating bats by drawing graphs of their calls on a PC screen.
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