Plus for the cues idea too. No need to be something too obvious, maybe the direction of the wind, facing of the flowers or leaning of the trees etc. I found my

Plus for the cues idea too. No need to be something too obvious, maybe the direction of the wind, facing of the flowers or leaning of the trees etc. I found myself doing a lots of systematic circular scan of the entire area -- Not hard, but a bit frustrating, and it's a brute force strategy (not really fun).