They have suffered severe population declines in the last half-century. Its black throat and gray back give it its name, but its bold black-and-white striped face is equally eye catching. Grey Warblers raise two small broods slowly during a long breeding season, rather than investing in one large quickly‐reared brood. The Black-throated Gray Warbler is a small songbird with a range of 637,000 square kilometers. The handsome yellow-and-gray Kirtland's Warbler is named for Dr. Jared Kirtland, whose Ohio farm provided the first specimen in 1851. STATUS: Native. 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). Kirtland's Warbler has one of the smallest breeding ranges of any North American bird. 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 male has a black throat, and the female and juvenile have gray or whitish throats. ; Range and Habitat: While many warbler species have overlapping ranges, using geographic clues can be a good way to narrow down exact species. It has two white wing-bars and alternating black and white stripes on its head. 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). Michael J. Guzy and Peter E. Lowther Version: 1.0 — Published March 4, 2020 Text last updated April 27, 2012 For these reasons the species is evaluated as Least Concern. The survey has shown a shallow decline in population of the grey warbler. Song and Sounds: Many warblers have distinctive songs, even though most don’t actually have a warbling quality.Learning how to bird by ear can help birders distinguish different species of warblers, even without the best views. 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. Each fall, Tundra Swan family groups merge to migrate south in large flocks of up to 100 birds, flying in a V formation. T. Marshall/wildfocus.org. Biologists finally discovered the first nest for the species in 1903, in northern lower Michigan. 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. 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. GREY WARBLER - RIRORIRO. 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. 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). 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