ATLANTA (AP) — Some evenings, Frank Bibin takes a chair, sets it under the pecan trees that grow outside his home and makes himself comfortable. In one hand he holds a flashlight; the other grasps a device no larger than a cell phone. He waits.

When shadowy figures begin darting among the leaves of his trees, Bibin switches on the little machine, a simple sonar tracker. He listens: click.click.click.

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