The Warbler Tree

I find it interesting that tonight when I walked around my apartment complex, just about the only birds I saw were located in the same tree as three days ago. Tonight (around 6 pm--late in the day to expect much) the warbler tree held about 6 Yellow-Rumped Warblers, 1 Nashville Warbler, and Kinglets of both species. I've never given much thought to how long individual birds spend in one place while in the midst of migration, but I would definitely put a bet down to say that the Nashville I saw tonight was the same one I observed four days ago.