vol. The dark-eyed junco is 13 to 17.5 cm (5.1 to 6.9 in) long and has a wingspan of 18 to 25 cm (7.1 to 9.8 in). (1994). From the Winter 2020 issue of Living Bird magazine. Male juncos tend to spend the winter farther north in order to shorten their spring migration and thus gain the advantage of arriving first at prime breeding territories. ", Marzluff: "And they favored males that are less aggressive and more attentive to their young. Male juncos return and reclaim the same breeding territory year after year. Tendencies to approach opponents at food, in contrast, increased with longer deprivation. It’s even possible that human habitation could be the driving force behind the shifts. Cristol DA, Nolan VJ & Ketterson ED. The longevity records for juncos are: White-winged - 7.5 years; Slate-colored - 11 years, 4 months; Oregon - 9 years, 9 months; Gray-headed - 10 years, 8 months. Watch for specialized threat displays designed to convey aggressive intent, such as the chickadee’s bill-up display in which he tilts his bill straight up. Clipboard, Search History, and several other advanced features are temporarily unavailable. All the rest of the Body black; but in some places dusky, inclining to Lead-color. 2002. "https://ssl." 2006 Mar;49(3):362-8. doi: 10.1016/j.yhbeh.2005.08.009. Males tend to have darker, more conspicuous markings than the females. A sample of the song can be heard at the USGS web site here (MP3) or at the Cornell Lab of Ornithology web site here. //
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