Automated recording unit installed at Ankeny National Wildlife Refuge
Detailed Description
An autonomous recording unit--or ARU--deployed at Ankeny National Wildlife Refuge in Jefferson, Oregon. The ARU is set to record 5-10 minutes of audio every 30 minutes during the time of day when male bullfrogs exhibit their loud breeding calls. Audio evidence of bullfrog presence can be used for early response to invasion.
Sources/Usage
Public Domain.