Sap sucking, Yellow-rumped Warbler


The Yellow-rumped Warbler (Setophaga coronata) is one of the most ecologically generalized of the warblers. It feeds primarily on invertebrates, but often switches to fruit during winter, utilizing a wide array of foraging maneuvers. It also uses a variety of foraging substrates. Reports of these warblers taking sap from sapsucker wells are rare. Here we report 3 instances of sapsucking Yellow-rumped Warblers from Arkansas. All three observations were immediately preceded by extreme cold weather with snow or ice precipitation. We hypothesize that opportunistic sapsucking from sapsucker holes may be another strategy employed by the species to meet its nutritional requirements during harsh winters, when insects are scarce.

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