GHO with possibly 2 chicks. Only one clearly visible.
You can see two owlets in the nest and maybe part of the third, if you look hard enough!
Mouse tests a common brand of mouse trap.
USB camera connected to laptop with motion detection software and low light source. Software package 'motion', 1 precapture, 2 frames per second, 1 post capture shot.
Note that the trap is originally set hair-triggered, right at the edge, but the mouse pulls the bait upwards and actually makes the trap safer - smart mouse ;-)