Perfect coincidence. Just got an email from the Rocky Mountain Bird Observatory asking for volunteers to sign up for banding northern saw-whets again this fall. Hours of silently standing around in the cold dark listening to an amplified digital recording of a saw whet call over and over and over, hoping a bird will fly into the mist nets so you can reach in, get bit and footed and bloody and infected, clock ticking while you and volunteers race to measure, weigh, record, band, shine UV light to count reflective feathers on the wings (technique for aging owls), band it and release it.
It's kinda like working the emergency room with no heat or sufficient light. Lots of boring until it gets VERY NOT BORING. And if you are lucky, you will get two or three birds in 6 hours of work.
Here's a link, add the www stuff to make it work, to some recordings of their calls. allaboutbirds.org/guide/Northern_Saw-whet_Owl/sounds