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very small North American and South American warblers

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It is also true that islands are smaller for some species, such as the California Gnatcatcher which needs 20 acres (49ha)/ pair (Atwood, 1992) than they are for horned Lizards where a single acre may contain 320 horned lizards (7-48 ha), or more; (Gerson, 2011; Jennings, 1987; Hager, 1992; McGurty, personal communications).
California Gnatcatcher Under the Endangered Species Act, 60 Fed.
In 1992, environmental extremists used the ESA to stop controlled bums of dangerous brush build-ups, claiming the preventive actions would endanger protected gnatcatchers and rats.
Even without evidence of interbreeding, the California gnatcatcher's conservation status might require reevaluation on the basis of recent genetic findings.
Creepers; Wrens; Gnatcatchers; Long Tailed Tits; Swallows; Kinglets; Bulbuls; White Eyes; Hypocolius; Cisticolas; Old World Warblers; Babblers.
I flush blue-gray gnatcatchers, yellow-rumped warblers, and both golden- and white-crowned sparrows on my way to the beach, where a score of sanderlings chase the waves like sprinters.
The 1.25-cm mesh size was small enough to prevent access by the smallest insectivorous birds (hummingbirds [Trochilidae] and gnatcatchers [Polioptila sp.]) in the system but large enough to permit transit of even the largest arthropod predators (sunscorpions, mantids, and large ground beetles [Carabidae]).
Common birds include turkey vultures, red-tailed hawks, Gambel's quail, desert doves, roadrunners, poor-wills, Costa's hummingbirds, gilded flickers, verdins, cactus wrens, black-tailed gnatcatchers, brilliant red cardinals and hooded orioles with their bright yellow heads.
Construction will obliterate an estimated 30 pairs of gnatcatchers and 44 pairs of coastal cactus wrens.
Considering their prominence in this forest, ashes and elms were not as strongly selected (except by Ruby-crowned Kinglets, Rose-breasted Grosbeaks and Blue gray gnatcatchers), but consistent avoidance of cottonwood seems notable.
Eastern populations of blue-gray gnatcatchers nest in deciduous forests, often near rivers and lakes; western populations nest in dry and open pinyon-juniper (Pinus-Juniperus) woodlands (Kershner and Ellison, 2012).
Water attracts all kinds of birds, including species that don't normally visit feeders like blue birds, swallows, gnatcatchers and other insect eaters.
Carson reported the toll that elm-disease spraying was taking on robins along with gnatcatchers, warblers and other birds.
Nevertheless among the remaining four passerines, we recorded over 45% of nests parasitized in Blue-gray Gnatcatchers, Painted Buntings, and White-eyed Vireos and <5% in the Lark Sparrow (Table 1).
They reported that nests of three black-capped gnatcatchers (Polioptila nigriceps) were parasitized.