fledgling (yellow warbler?)

I was at John Heinz National Wildlife Preserve this weekend and came upon several fledglings hopping around in the brambles off of the main pedestrian path. I knelt down in the path and waited for a chance to get some shots of them. this little guy hopped into view and posed for a few seconds before heading further into the brush. This was also the only 15 minutes of sunlight during what was otherwise a cloudy morning.