butter butts
n.— «Audubon warblers, the Western form of the yellow-rumped warbler, also were moving through in large numbers early last week. These blue and yellow warblers are affectionately called “butter butts” by many birders due to their flashing yellow rump patch, which is so visible as they flit away from you.» —“Cold spring mornings a tough time for hummers” by Sylvia Brockner Canyon Courier (Evergreen, Colorado) May 24, 2007. (source: Double-Tongued Dictionary)
Further reading
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