We’ve been using passive acoustic monitoring units, AKA audio recorders, to listen for the call of the invasive American Bullfrog at CVWMA. You may see one of these units out in the marsh lands. They are scattered all along the boundaries to detect any potential movement of the bullfrogs into our marshes. We do weekly uploads and analysis of the audio data from all these units so we can respond to any positive hits of bullfrog calling as soon as possible.
The male bullfrogs are the ones doing all the calling, and they make a low pitched call that is quite unique. So far, this year has been relatively quiet around CVWMA, with only one bullfrog detected adjacent to CVWMA boundaries. As this is being written, technicians from the American Bullfrog Program are on the hunt to remove this individual before he finds suitable habitat to call home. In the process, they intercepted and removed a giant female Bullfrog!
Using this passive audio recording tech-nology to monitor for various wildlife species like the invasive Bullfrog has been quite suc-cessful and we continue to get better at using it as time goes on. Efforts to stop the invasion of the American Bullfrog moving North from source populations in Idaho are ongoing but are already having a positive impact!
David Bradford from the American Bullfrog Program with a large female bullfrog removed near CVWMA, | 
