Ever heard an owl?

I woke up in the middle of the night last night (or I should say really early this morning) and heard an owl. 

He would make several warbling sounds I can't quite describe, followed by "hoo, hoo, hoo." 

I started counting the seconds between the end of one group of sounds and beginning of another: one, one-thousand, two, one-thousand...and I'd get to five before he started up again. He was in quite a rhythm.

Eventually it seemed to stretch to six seconds between outbursts, then suddenly all was quiet.

Did he go to sleep or catch his prey? Hmm....