Up until two weeks ago I was birding everyday, getting shots of the usual suspects in my area, but one day I went out and it was dead silent. Beautiful weather, no breeze, sunny, but absolutely zero bird-life. Ever since then, it's been silent, birds are staying in the brush/foliage and not showing themselves as much as earlier in the year. I haven't shot a decent bird photo since, and I've switched to macro photography instead. Since this is my first full year of birding, I haven't experienced the Autumn behavior yet, so am thinking this is a change in behavior in preparation for migration.