Trapping burrowing owls is pretty simple, we put down a little cage with one-way doors on both sides in the entrance to the burrow, and the owl simply becomes trapped when it tries to enter, or (more often) when it tries to exit the burrow.

An owl in a trap, revealed through the magic of a Photoshop knockoff program.

And here's one of the little guys up close and personal. After banding it and taking other measurements, we let him go.