I had the opportunity to poke around Jackman Wetlands for a couple of hours yesterday. 4 Wilson's Warblers and a Bullock's Oriole were a nice surprise. Also saw a bird with some Yellow-rumps very close to the water that I identified as a Warbling Vireo because of the pattern around its eye, but now I wonder whether it was a Tennessee warbler. Anyone know which is more likely? Or if there is a noticeable size difference between Yellow-rumped Warblers and Warbling Vireos? As far as I could tell, the bird I saw was at least as big, maybe slightly bigger than the Yellow-rumps it was with.
Hi James. Thanks for sharing your sightings! The bird you saw in all likelihood is a Warbling Vireo, a common bird this time of year. A Tennessee Warbler in the valley is possible but it is a rare sighting. Slightly bigger that yellow-rumped helps me think you saw a Warbling Vireo.