I’ve been seeing this Cape May Warbler for several days in the same small hawthorn tree. I posted photos online and someone noticed what look like scale insects on the branches. Scale insects are a group of insects that don’t move and suck plant juices for sustenance. You can see them festooning the branches in the lower right corner of the photo — they look like tiny white flakes or clumps of rice grains. Putting two and two together, I’m guessing the Cape May Warbler has been frequenting this particular hawthorn because of the abundant scale insects and the food they provide it. More photos of the Cape May Warbler and scale insects are at my eBird checklist for October 5, URL below.
October 5, 2020