[4], In the breeding season, Bay-breasted Warblers feed primarily on insects and spiders, especially the spruce budworm (Choristoneura fumiferana). Three different warbler species live in the same tree. An individual’s or species’ ecological tolerance is ... Bay-breasted warbler Cape May warbler Black-throated green warbler Myrtle warbler . Bay-breasted Warbler. Learn more about Bay-breasted Warbler from…. Females and fall birds are duller; most show at least some chestnut coloring on sides. The Bay-breasted Warbler, Dendroica castanea, is a New World warbler. Adult males in breeding plumage are primarily grayish above, with two white wing bars, dark streaks on the back, and a creamy neck patch. The young are altricial at birth, with limited down.[4]. Distribution / Range. Take Merlin with you in the field! Its numbers vary from year to year, and are likely to increase quickly during population explosions of the spruce budworm or other forest pests. Your Online Guide To Birds And Bird Watching. [10], "The Clements Checklist of Birds of the World", "Bay-breasted Warbler - All About Birds, Cornell Lab of Ornithology", "Bay-breasted Warbler - Audubon Field Guide", https://en.wikipedia.org/w/index.php?title=Bay-breasted_warbler&oldid=985180479, Native birds of the Northeastern United States, Taxa named by Alexander Wilson (ornithologist), Articles containing Ancient Greek (to 1453)-language text, Taxonbars without secondary Wikidata taxon IDs, Taxonbars with automatically added original combinations, Creative Commons Attribution-ShareAlike License, This page was last edited on 24 October 2020, at 13:05. Listen carefully for extremely high-pitched, squeaky-wheel song, similar to a fast Black-and-white Warbler. Comprehensive life histories for all bird species and families. The Bay-breasted Warbler (Setophaga castanea) is a small species of songbird in the New World warbler family, Parulidae. Breeds in the boreal forest. The nest is cup-shaped and primarily composed of plant material, with spider silk often utilized as well. [6] On wintering grounds in the tropics, fruit forms a majority of the diet. Winters in Central and South America. They readily join mixed-species flocks in the nonbreeding season, when they consume more fruit than insects. The range of abiotic and biotic conditions under which a species lives. One species feeds at the top of the tree, the second species feeds in the middle part of the tree, and the third species feeds at the bottom of the tree. Title: 2020 Evolution and Diversity Author: These flocks seek food in the forest canopy, and the Bay-breasted Warbler is often an aggressive member of the unit, bullying smaller species from potential food sources. In fall, nonbreeding Bay-breasted Warblers may look very similar to Blackpoll Warblers (Setophaga striata). Chestnut-sided Warblers may be easily differentiated by the extent of the chestnut, which does not reach the throat or crown. Setophaga castanea. To avoid competition with similar species, Bay-breasted Warblers concentrate their foraging on the breeding grounds to the interior middle portions of coniferous trees. Title: 2020 Evolution and Diversity Author: The face is black, and the crown, throat, and sides are a dark chestnut color. A loss of insect prey and global climate change are contributing factors to decline. Fundamental Niche Realized Niche Cape May Warbler Cape May Warbler Blackburnian Warbler Black-throated Green Bay-breasted Yellow-rumped Realized Niche biological interactions such as competition that restrict fundamental niche to more narrow range The range of abiotic and biotic conditions under which a species lives. In breeding plumage, the Bay-breasted Warbler may be confused with the Chestnut-sided Warbler (Setophaga pensylvanica), which has similar chestnut coloration on the sides. Do all three species occupy the same niche? It is one of thirty-four species in the diverse genus Setophaga. Dullest birds are similar to Blackpoll and Pine Warblers; look for streaks on back, well-defined wingbars, and cleaner greenish-yellow head and neck. Two of the most challenging species to separate from each other during fall migration are the Blackpoll and Bay-breasted Warblers – so much so that observed individuals are often referred to by birders as “Baypolls”. This is a characteristic warbler of spruce forest in eastern Canada in summer. Dullest birds are similar to Blackpoll and Pine Warblers; look for streaks on back, well-defined wingbars, and cleaner greenish-yellow head and neck. Two bold white wingbars. Preferred habitats include open spruce forests and deciduous woodlands. Prefers conifers during migration, but can be found in any woodland. A grayish warbler highlighted with rich red-brown and creamy buff in the summer, the Bay-breasted transforms itself in the fall into a mostly green and white warbler with a hint of bay on the flanks. These birds are migratory, wintering in northern South America. The rufous on the flanks is limited and may even fade away entirely in nonbreeding females. Chestnut-sided Warblers also have a bright yellow crown, dark mask, and white cheek and throat in breeding plumage. Bay-breasted Warblers feed by hopping and flying around in the inner parts of trees and watching for insect prey, which they capture by gleaning and occasionally hovering. However, the species falls into the “confusing fall warblers” category, with nonbreeding males, females, and juveniles closely resembling their counterpart Blackpoll or Pine Warblers.. Bay-breasted Warblers feast on eastern spruce budworm, a native but often destructive insect. Free, global bird ID and field guide app powered by your sightings and media. The two white wing bars are present in all plumages. However, Blackpoll Warblers never have a hint of chestnut coloration on the flanks, and also have yellowish feet, unlike the black appendages of the Bay-breasted Warbler. Explain. The adult male Bay-breasted Warbler is unmistakable, with its black face and chestnut head. 15 June 2013. Breeding females are similar in overall pattern to the males, but are paler and duller. [7], The genus name Setophaga is from Ancient Greek ses, "moth", and phagos, "eating", and the specific castanea is Latin for chestnut-coloured. Many individuals cross the Gulf of Mexico on their long-distance migration, although some travel north and south along the Mexican sh… Wintering Bay-breasted Warblers often form mixed-species flocks with other neotropical migrants and resident species. The species winters in the wet lowland forests of northeastern South Americaand southern Central America, and may be seen during spring and fall migration across the eastern half of the United States in a variety of vegetative communities. [3] The species winters in the wet lowland forests of northeastern South America and southern Central America, and may be seen during spring and fall migration across the eastern half of the United States in a variety of vegetative communities. The global population is estimated to be fewer than 10 million individuals. ay‐breasted Warbler Setophaga castanea Federal Listing N/A State Listing Global Rank S5 State Rank S4 Regional Status Very High Photo by Len Medlock Justification (Reason for Concern in NH) Populations of the ay‐breasted Warbler have been in decline in the United States based on data from the reeding ird Survey (Sauer et al. Prefers conifers during migration, but can be found in any woodland. Breeding males are distinctive with dark reddish-brown cap and sides, along with buffy nape. What’s Your Niche? In the nonbreeding season, both sexes gain olive-green feathers on the back, nape, and head. Many individuals cross the Gulf of Mexico on their long-distance migration, although some travel north and south along the Mexican shore. The Bay-breasted Warbler is of moderate conservation concern because of its relatively narrow breeding range (primarily in belt of closed boreal forest in Canada), and its even narrower winter range in tropical lowland forests. For me, seeing a Bay-breasted Warblers is a rare treat, particularly in spring when they are late arrivals and can be very difficult to find and follow in the newly opened upper-canopy levels. Version 1.00. Uncommon during migration, these birds are numerous in the forests of northern Canada, where they specialize on spruce budworms. 01:03 © Timothy Barksdale | Macaulay Library In most of U.S. , only seen during migration. They breed in northern North America, specifically in Canada, into the Great Lakes region, and into northern New England. What’s Your Niche? May also be found along the coast of California. Bay-breasted Warbler: Breeds from northeastern British Columbia and the Northwest Territories east to Maritime Provinces and south to the northern Great Lakes region and northern New England. Nicholas J. Gotelli & Aaron M. Ellison. Average clutch size is 4-7 whitish eggs with dark spots. An individual’s or species’ ecological tolerance is ... Bay-breasted warbler Cape May warbler Black-throated green warbler Myrtle warbler . Breeds in the boreal forest. Bay-breasted Warblers breed in the boreal spruce-fir forests of eastern and central Canada, as well as the extreme northern United States. In most of U.S., only seen during migration. [4], Nests are typically constructed in the lower portion of a spruce or fir tree. Basic Description. Although currently classified by the IUCN as Least Concern, Bay-breasted Warblers, like many songbirds, are facing population declines across their range.

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