A birdwatching session specifically focused on seeing owls, typically done at night. I took my two older kids on an owl prowl last weekend, and we all had a fantastic experience! I know the nature reserve hosts nighttime owl prowls throughout the summer and into early Fall.
n. a nighttime session of owl watching. (Bird watchers humor.) We went on an owl-prowl last night and spotted a spotted owl. It was a barn owl, but we spotted it.