Species Account
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Winter Range Forested mountains of Columbia and Venezuela south on the east slope of the Andes to eastern Peru and northern Bolivia, mainly at elevations between 600 and 1500m. Breeding Habitat In the Northeast, Cerulean Warblers inhabit deciduous forests with tall, mature trees, mostly near stream bottoms, along lake and river shores, or on river islands. In some areas, they are also found in mature forests on dry slopes and ridges. Common tree species include oaks, maples, sycamore, black locust, elm, and cottonwoods.
Description Male:
Light
blue (cerulean) upperparts and white underparts. Indistinct black streaking on back
and uppertail coverts. Narrow black necklace on upper breast, with some black
streaking on the flanks. Two white wing bars. Vocalizations The typical song has three parts--2 or 3 slow buzzy notes, then several rapid buzzy notes without changing pitch, followed by a longer buzzy note on a higher pitch; zray zray zray ze-ze-ze zreeeee. Some variation may be noted (listen to cassette). Song is similar to those of the Northern Parula and Black-throated Blue Warbler. Foraging Strategy Forages by gleaning, hover-gleaning, and hawking or sallying (takes short flights from a perch to capture flying insects). Generally takes food from leaf bases and foliage in the canopy of a variety of trees. Diet Insectivorous Behavior and Displays Males generally sing high up in mature trees; may sing all day early in the breeding season. Courtship Unknown Nesting Nest
site: Often found on lateral limbs of the midstory and canopy trees in deciduous
forests that are located near an open space. They are generally concealed from above
by clumps of leaves from other branches or vines growing alongside the branch supporting
the nest. Often found in oaks. The final report, "An Atlas of Cerulean Warbler Populations," is now complete and has been submitted to the USFWS.
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