This fall I recorded two separate instances of sub-song in the Marsh Wren (Cistothorus palustris) .
1) Vernon Marsh, Waukesha County, WI. September 6, 2009.Marsh Wren subsong
2) Horicon Marsh, WI, November 8, 2009. This is a very late date for Marsh Wrens in Wisconsin. The BNA account mentions juveniles practicing song into October, so in that respect this seems rather late as well.Marsh Wren subsong
The Marsh Wren quality is evident in these juvenile efforts but they lack the organization, structure and assurance of the adult song.
Compare to adult – recorded at Vernon Marsh on June 14, 2009. Here we have six songs sung in succession, all different (immediate variety) but all highly structured, with definite organization and exact duplication of song units.Marsh Wren