Journal
SOUTHWESTERN NATURALIST
Volume 45, Issue 2, Pages 154-158Publisher
SOUTHWESTERN ASSN NATURALISTS
DOI: 10.2307/3672456
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Certain calls of two species of parids, bridled titmouse (Baeolophus wollweberi) and Mexican chickadee (Poecile sclateri), are compared with those of some heterospecific flock members during the non-breeding season. Marked similarities occur in acoustic structure, and in some cases patterns of call delivery, between calls of the parids and some flock associates. A call of the Mexican chickadee, golden-crowned kinglet (Regulus satrapa) and brown creeper (Certhia americana) are very similar, with another Mexican chickadee call resembling that of the ruby-crowned kinglet (R, calendula.) and a bridled titmouse call. Marked resemblance also occurs between the titmouse and a ruby-crowned kinglet call. The evolutionary basis for the similarities is unknown, but vocal similarities may facilitate certain interactions, such as mobbing, in mixed species flocks.
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