They have suffered severe population declines in the last half-century. ; Range and Habitat: While many warbler species have overlapping ranges, using geographic clues can be a good way to narrow down exact species. The Black-throated Gray Warbler is a small bird with a gray back and white to off-white undersides with black streaks. The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). Grey Warblers raise two small broods slowly during a long breeding season, rather than investing in one large quickly‐reared brood. Biologists finally discovered the first nest for the species in 1903, in northern lower Michigan. T. Marshall/wildfocus.org. Each fall, Tundra Swan family groups merge to migrate south in large flocks of up to 100 birds, flying in a V formation. For these reasons the species is evaluated as Least Concern. STATUS: Native. The handsome yellow-and-gray Kirtland's Warbler is named for Dr. Jared Kirtland, whose Ohio farm provided the first specimen in 1851. It has two white wing-bars and alternating black and white stripes on its head. It breeds in pine and pine-oak woodlands in parts of southwestern British Columbia, and the western United States north to Wyoming and Washington, and south to Arizona and California. The population size is extremely large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). The male has a black throat, and the female and juvenile have gray or whitish throats. The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). GREY WARBLER - RIRORIRO. Kirtland's Warbler has one of the smallest breeding ranges of any North American bird. The survey has shown a shallow decline in population of the grey warbler. Its black throat and gray back give it its name, but its bold black-and-white striped face is equally eye catching. The Black-throated Gray Warbler is a striking yet monochrome warbler that wears only a tiny spot of yellow just above and in front of the eye. Since the end of World War II there has been a decline in forest songbird populations over much of the eastern United States.For example, in Rock Creek Park in the middle of Washington, D.C., populations of Red-eyed Vireos have dropped by 79 percent and Ovenbirds by 94 percent. In New Zealand's mild climate the warbler's food supply may not decline severely in winter, and the population of warblers may remain so close to the limit set by food that extra for breeding is hard to obtain. They breed in wet, shrubby tangles of the Upper Midwest and Appalachians, and spend winters in open woodlands and shade-coffee plantations. Michael J. Guzy and Peter E. Lowther Version: 1.0 — Published March 4, 2020 Text last updated April 27, 2012 A boldly marked warbler with a color pattern all its own, Golden-winged Warblers are slim, silvery gray birds with golden flashes on the head and wings. 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