



I had traveled most of the way there when I heard one of the targets, an orchard oriole, singing from a line of maples over an overgrown pasture. After stopping for a flock of warblers at roadside (the best flock I would find all day) including male BT green, cape may, and redstart and female black and white, I started picking up grasshopper sparrows in some of the overgrown fields around Sarett. A few miles farther down the road at Brown Sanctuary the chat was quiet when I arrived. I headed down to the marsh quickly hearing soras (which were silent for Birdathon) and eventually hearing marsh wrens (also silent for Birdathon), and not hearing the Virginia rail we had then. Prothonotary warbler was the next target and it sang more or less on cue after a great-horned owl flushed down the river (also missed a few days ago). By the time I made it back up to the bike the chat was singing. I waited a little to see if it would come out in the open without success. With that it was back to Sarett to try to pull out one of the migrants. It was still quite windy and I found it hard to find sheltered areas that could harbor the birds. There were a few birds around, black-throated green, chestnut-sided, and a yellow-throated vireo but I found it slow going with the exception of the empids. Least flycatchers seemed to be setting up territories everywhere and were singing and perching prominently, allowing good scope views for study. The olive backs were not really that contrasting from the rest of the bird at all. The difference between them and the yellow-bellied that appeared, calling, was quite pronounced, with the yellow-bellied being a much greener bird overall with warm yellow wash across the flanks and belly. Arguably, the yellow-bellied was the bird I most needed given that the others can still be found in few months (just gotta get the olive-sided before they disappear at the very front end of southbound migration) and they'll be virtually un-identifiable in fall.


colored not far from it as well (which caught me offbalance crossing the flooded trail on a wobbly log so I missed what would have been a county lifer). Not to worry though, after picking up another 5 or so common warblers and RC kinglet (along with a not-so-common Connecticut found by Tim) Jon Wuepper asked us if we'd heard the least bittern ... uh least bittern??!! We retraced our steps and heard the bird we must have walked right past while concentrating on the warblers, backing into a sweet county lifer. We kept picking up birds as we went down the best section of the Yellow Birch trail, and then picked up more as we doubled back including goodies like orange-crowned and then a Kentucky that Phil Chu stayed with long enough to see. We went up top into the dunes long enough to hear multiple prairies as well as vesper sparrows and then it was back to the car to start picking up stake-out birds in various locations, i.e. PB grebe, RH woodpecker, greater scaup (thanks Kip), a bonus kingfisher at Grand Mere, before hitting Tiscornia finding 3 species of terns and a turnstone and then up to Sarett. Brown Sanctuary produced big time with a chat singing on the way in, a sandhill crane out in the marsh, a summer tanager above the trail on the way to the prothonotary which wasted no time in calling, then another little flock of warblers with another great look at an orange-crowned.
ucky's earlier. We went back for it and it popped up right on cue (Oporornis #3) and I briefly had my closest ever look at one. We made a full circuit but wind had picked up and the morning was over and we added little other than a late blue-headed vireo new for the Bigby year (thought I would have to pay the mosquitoes in blood this fall for missing it in the spring). I ended up climbing up to the top of the hawkwatch dune since it seemed like SE winds, but found little movement (and what movement there was seemed paradoxically into the wind leaving me a lot of distant wing-on views). A prairie warbler was quite cooperative right on top of the trail though. Despite being in a relatively small un-leafed out tree it still took forever to find him (I can see why I had so much trouble finding the Ann Arbor bird a few years ago in a fully leafed out canopy), but once zero-ing in on it did manage some pics (and hopefully some video on youtube, check back soon):


Well, here's some more details on the gull. The first pic is a blow-up of one of the original pics, it shows the details of the bill and is my best of the orbital ring. The orbital ring appeared reddish in the field though it was hard to be sure in the overcast with the dark eye. Interestingly the camera picked up a much pinker lavender type colorNext is a blow-up of the best spread-wing showing P10-P5 as well as a new pic showing P9-P2 and my description of these feathers copied from my MBRC write-up:

P10: leading edge a darker gray than rest of bird, terminal centimeter or so long white spot covering both trailing and leading edge
P9: leading edge contrasts slightly with trailing edge though not as dark as the on P10 with small white mirror visible on leading edge prior to small white tip of both leading and trailing edge
P8: some darker contrast most prominent on the proximal aspect of the leading edge, white tip slightly broader than P9, no mirror visible though does have a white “moon” or “pearl” on trailing edge
P7: similar to P8 with some darker contrast on leading edge but a slightly small
er white tip and likely a somewhat larger white “moon” or “pearl” on trailing edge
P6: less contrasting leading edge than higher numbered primaries with white tip slightly broader than P7 with more white on leading edge. White “moon” or “pearl” crosses from trailing edge onto leading edge as well bisected by darker shaft
P5: leading edge minimally contrasting. Broad white tip blends more suffusely into gray color of body of feather. Single ovular vague gray opacities on both leading and trailing edge in the white
P4-P2: gray feathers with white tips. Some contrast to leading edge of feathers though this may be related to light and different angle of feather barbs
Now the task is to go through the books and read about the different hybrid combinations' wing patterns.




orus at Warren Woods with both waterthrushes, ovenbird, wood thrush, veery, barred owl, yellow-throated vireo and great-crested flycatcher. We were able to find two very local birds, yellow-throated warbler and white-eyed vireo, at traditional locations in the south part of the county but dipped on parula and cerulean in the cold and really didn't find significant numbers of other migrants. I might have jinxed us, however, by taking a photograph of an oddly yellow, rather than red, prairie trillium. (It's a Big Day, dammit!)
Options I've come up with: