[cobirds] late warblers

Here we go again with the late warbler reports.  Recently there have been reports of Yellow-rumps, Orange-crowns, Northern Parula, Black-throated Gray, possibly a Mourning, and a Palm.  I would love to know what these desperadoes are eating.  As in the past, the likely items are aphids, of which we have a zillion types, most of them partial to one particular type of woody plant.  The Yellow-rumps in bur oaks at CSU at present that Sean Walters alerted me to are probably after Dusky-winged Oak Aphids.  Art Hudak just mentioned a Palm at Ft. Logan under a willow, which means Giant Willow Aphids are likely targets.  If people finding or chasing these birds could perhaps make an effort to at least identify the tree or trees these late warblers favor, I would appreciate it.  Take a picture of a trunk or a leaf.  Better yet, look up close where you have seen the bird foraging.  Aphids are small, but hopefully most of us would know one if we saw one.  Again, take a pic if you can.  Has anyone checked the "Bay-breasted/Parula pine tree" in Boulder, Pueblo City Park, Denver West, Centennial Park in Canon City, Centennial Park in Littleton, and other historical late warbler sites?

I would also mention that I don't think the hackberry gall-making psyllid emergence and movement to overwintering sites in nearby trunk bark is over yet.  The beginning of this event was about on time in late September but for it to go on this long is a bit extended beyond normal.  Today at Grandview Cemetery, fox squirrels were still nipping at nipplegalls (something they wouldn't do if the galls were empty of makers) and both Black-capped and Mountain Chickadees, plus Brown Creepers, were working the hackberries.  Hackberries are still worth checking.

I'm going to Eaton Cemetery in the morning.

Thank you.

Dave Leatherman
Fort Collins