Sorry, I'm getting behind in my blog postings. On Monday the 25th, several yellow warblers were flitting about the gray birches that border the trail, and occasionally moving over to the grasses by the water's edge. I caught this male on a stalk of wool-grass, which seems to be of interest to the warblers. I know they are primarily insect eaters (especially caterpillars), with the occasional berry thrown in, but didn't think they were interested in seeds. Perhaps there is some insect that frequents the wool-grass that they are after.
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