On their wintering grounds in Mexico they've been seen sipping aphid honeydew, as well no doubt as consuming the honeydew producers. On migration and in winter yellow-rumped Warblers also eat fruits, including bayberry and wax myrtle, and wild seeds. They are mainly insectivorous in summer, eating a variety of insects, but are especially known for eating insect species undergoing population irruptions, such as spruce budworm and various aphid species. Yellow-rumped Warblers are opportunistic foraging generalists. Second image copyright tgreyfox under a Creative Commons Attribution -ShareAlike 2.0 Generic Licence The black-fronted warbler (subspecies nigrifons) has a black head and front.įirst image copyright Russ under a Creative Commons Attribution 2.0 Generic Licence goldmani) is similar to Audubon's warbler, but has a white lower border to the yellow throat and otherwise darker plumage in males the back is black. There are marked differences between the subspecies: Male myrtle warblers ( Setophaga coronata subspecies coronata) have a white throat and eye stripe, and a contrasting black cheek patch, whilst male Audubon's warbler (subspecies auduboni) have an additional yellow throat patch. Females (see second picture below) in summer have streaked backs of black on blue-green and similar conspicuous yellow patches. The adult male yellow-rumped warbler ( Setophaga coronata, see first picture below) in summer has a streaked back of black on slate blue, white wing patches, a streaked breast and conspicuous yellow patches on the crown, flank and rump.
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