Vireo—Philadelphia or Warbling? in Help Me Identify a North American Bird Posted August 28, 2019 Need help with this Vireo I photographed today in an urban park in St. Louis, MO. I have narrowed it to Warbling and Philadelphia. I suppose Bell's is a possibility, but I don't believe one has ever been reported this far into the St. Louis urban area. There was definitely yellow on the bird, but the photos taken amongst the leaves and sunshine make it look extremely yellow. THANKS FOR YOUR HELP.