John Hooper Bowles, The Birds of Washington (Volume 1 of 2…
“ FEMALE SHUFELDT JUNCO ON NEST. On a sunny day in March the Juncoes gather for a grand concert. The males mount the bush-tops and hold forth in rival strains, while the females lurk under cover and take counsel of their hearts. Junco’s song is a sweet little tinkling trill, not very pretentious, but tender and winsome. Interspersed with this is a variety of sipping and suckling notes, whose uses are hard to discern. Now and then, also, a forcible kissing sound may be heard, evidently a note of repulsion instead of attraction, for it is employed in the breeding season to frighten enemies. ”
