…After decades of biologists going out into the woods and physically counting animals, the agency is now turning to sound recorders and AI because they’re cheaper and can gather a lot more information. “Autonomous recording units with rechargeable batteries, memory cards, and the software costs are coming in the $600-$700 range per device,” said Oregon Department of Forestry biologist Corey Grinnell. The agency is currently spending millions to send biologists into the forests to conduct callback surveys, where they mimic a bird call and count responses. …The agency now has 23 devices and plans to deploy more as it moves away from callback surveys. …There is some concern that using recorders might put biologists out of work. But lead ODF biologist Vanessa Petro isn’t so sure. She said that once the AI counts birds in a recording, the tally will need to be checked by an actual biologist.