* Regulus calendula Ruby-crowned Kinglet

One species, the Ruby-crowned Kinglet, differs sufficiently in its voice and plumage to occasionally be afforded its own genus, Corthylio.

Five species have a single stiff feather covering the nostril, but in the Ruby-crowned Kinglet, this is replaced by several short, stiff bristles.

The two generalists, Ruby-crowned Kinglet and Common Firecrest hunt more in flight, and have smoother soles, shorter hind claws and a longer tail.

The exception is the Ruby-crowned Kinglet, the largest species, which has a strongly red crest and no black crown stripes.

A partial list is: Common Loon, Great Blue Heron, American Bittern, American Black Duck, Wood Duck, Ring-necked Duck, Hooded Merganser, Common Merganser, Broad-winged Hawk, Ruffed Grouse, American Woodcock, Common Snipe, Spotted Sandpiper, Herring Gull, Barred Owl, Saw-whet Owl, Whip-poor-will, Common Nighthawk, Chimney Swift, Ruby-throated Hummingbird, Belted Kingfisher, Tree Swallow, Bank Swallow, Barn Swallow, Northern Flicker, Pileated Woodpecker, Yellow-bellied Sapsucker, Hairy Woodpecker, Downy Woodpecker, Eastern Kingbird, Great Crested Flycatcher, Eastern Phoebe, Yellow-bellied Flycatcher, Alder Flycatcher, Least Flycatcher, Eastern Wood Pewee, Olive-sided Flycatcher, Grey Jay, Blue Jay, Common Raven, Common Crow, Black-capped Chickadee, Boreal Chickadee, White-breasted Nuthatch, Red-breasted Nuthatch, Brown Creeper, Winter Wren, Gray Catbird, Brown Thrasher, American Robin, Wood Thrush, Hermit Thrush, Swainson's Thrush, Veery, Golden-crowned Kinglet, Ruby-crowned Kinglet, Cedar Waxwing, Common Starling, Red-eyed Vireo, Warblers, Red-winged Blackbird, Rusty Blackbird, Common Grackle, Brown-headed Cowbird, Scarlet Tanager, Rose-breasted Grosbeak, Evening Grosbeak, Indigo Bunting, Purple Finch, American Goldfinch, Dark-eyed Junco, Chipping Sparrow, White-throated Sparrow, Swamp Sparrow and Song Sparrow

The Ruby-crowned Kinglet, an American Regulus species and a potential vagrant in Europe, could be more difficult to distinguish.

A ringed Ruby-crowned Kinglet recaptured in a mist net

Northern birds remain further north in winter than the Ruby-crowned Kinglet.

Hybridization with Ruby-crowned Kinglet has been reported to have possibly occurred.

The Ruby-crowned Kinglet ( Regulus calendula ), is a very small passerine bird found throughout North America.

The Ruby-crowned Kinglet is not closely related to other kinglets, and is put in its own subgenus, Corthylio.

The Ruby-crowned Kinglet is a very small bird, being long, having a wingspan of, and weighing.

Compared to the related Golden-crowned Kinglet, the Ruby-crowned Kinglet is slightly larger, more elongated, and has greener plumage.

Other vocalizations of the Ruby-crowned Kinglet include alarm calls, simple contact calls, and begging calls produced by chicks.

The Ruby-crowned Kinglet was first described in 1766, in the 12th edition of Carl Linnaeus's Systema Naturae.

As a result of its larger size, strongly red ( rather than orange or yellow ) crest and lack of black crown stripes, as well as its distinctive vocalisations, the Ruby-crowned Kinglet is sometimes considered different enough from the Old World kinglets and the other American species, the Golden-crowned Kinglet, to be sometimes assigned to a separate genus, Corthylio.

The recent counting indicates that the Ruby-crowned Kinglet population is on the rise.

* Ruby-crowned Kinglet Information and Photos-South Dakota Birds and Birding

* Ruby-crowned Kinglet Regulus calendula-USGS Patuxent Bird Identification InfoCenter

# REDIRECT Ruby-crowned Kinglet

Ruby-crowned Kinglets forage actively in trees or shrubs, mainly eating small insects and spiders, some berries and tree sap.

Female and juvenile Ruby-crowned Kinglets lack the ruby-red crown patch, but compared with the similarly crestless juvenile Goldcrest, the American bird is larger in size, has an obvious whitish eyering, and yellowish wing bars.

* The Guadalupe Ruby-crowned Kinglet ( Regulus calendula obscurus ) is close to extinction, if it indeed still exists.

The Ruby-crowned Kinglet's vocalizations are remarkably loud and complex for its size.

Other birds seen in the Wilderness include White-throated Swift, Violet-green Swallow, Rock Wren, Canyon Wren, Killdeer, Cliff Swallow, Black-throated Sparrow, Ruby-crowned Kinglet, Blue-gray Gnatcatcher, Black-chinned Hummingbird, Great Blue Heron, flycatchers and various species of duck.

This variation is greater than in any other passerine family ( unless the Kinglet Calyptura belongs with the cotingas, which would then have greater variation ).

They may be the most diverse passerine family in body size, ranging from the 8-cm Kinglet Calyptura to the 50-cm male Amazonian Umbrellabird, although the smaller bird may not be a true cotinga.

The Golden-crowned Kinglet is similar in appearance to the Common Firecrest and has been considered to be its New World equivalent, but it is actually closer to the Goldcrest.

It has distinctive vocalisations, and is different enough from the Old World kinglets and the other American species, the Golden-crowned Kinglet, to be sometimes assigned to a separate genus, Corthylio.

In each continent, one species ( Goldcrest in Eurasia and Golden-crowned Kinglet in North America ) is a conifer specialist ; these have deeply grooved pads on their feet for perching on conifer twigs, and a long hind toe and claw for clinging vertically.

Cytochrome b gene divergence between the Madeira Firecrest and the European bird is 8. 5 %, comparable with the divergence level between other recognised Regulus species, such as the 9 % between the Goldcrest and the Golden-crowned Kinglet.

Cytochrome b gene divergence between the Madeira Firecrest and the European bird is 8. 5 %, comparable with the divergence level between other recognised Regulus species, such as the 9 % between the Goldcrest and the Golden-crowned Kinglet.

The Golden-crowned Kinglet ( Regulus satrapa ) is a very small songbird.

Golden-crowned Kinglet is a widespread North American bird, breeding in many US states, and over much of Canada, and wintering across much of the continent south to Florida, Texas and Mexico.

Also known as Imperial Fiddlesticks, there is no checking or checkmate in Kinglet Chess – kings are treated like any normal piece.

One inventory in June 2012 found the following species: ovenbird, Eastern Whip-poor-will, wilson's snipe, alder flycatcher, Warbling vireo, red-eyed vireo, winter wren, wood thrush, American robin, veery, gray catbird, common yellowthroat, Chestnut-sided Warbler, northern waterthrush, Black-throated Green Warbler, northern parula, American Redstart, white-throated sparrow, indigo bunting, red-winged blackbird, American goldfinch, osprey, Ring-necked Duck, Hooded Merganser, Pied-billed Grebe, Double-crested Cormorant, Great Blue Heron, Bald Eagle, Virginia Rail, American Herring Gull, Ring-billed Gull, Chimney Swift, Belted Kingfisher, Marsh Wren, House Wren, Eastern Bluebird, Pine Warbler, Black-and-white Warbler, Savannah Sparrow, Northern Cardinal, Eastern Meadowlark, Bobolink, bank swallow, cliff swallow, barn swallow, White-breasted Nuthatch, Ruffed Grouse, Ruby-throated Hummingbird, Blue-headed Vireo, Red-breasted Nuthatch, Lincoln's Sparrow, Rose-breasted Grosbeak, Pine Siskin, Purple Finch, Canada Warbler, Magnolia Warbler, Nashville Warbler, Golden-crowned Kinglet, Morning Warbler, Dark-eyed Junco, and Northern Rough-winged Swallow.

The female Song Thrush builds a neat cup-shaped nest lined with mud and dry grass in a bush, tree or creeper, or, in the case of the Hebridean subspecies, on the ground.

The Pacific Swallow builds a neat cup-shaped nest, constructed with mud pellets collected in the beak, under a cliff ledge or on a man-made structures such as a building, bridge or tunnel.

It builds its cup-shaped nest on the ground and usually lays three eggs.

It builds its cup-shaped nest placed on the ground or rocks in a hole, ledge or mud bank and is always located close to water.

It builds its cup-shaped nest made up of fine grass and rootlets matted with moss and cobwebs.

It builds its cup-shaped nest in a tree, concealed in dense masses of foliage.

The Green-backed Eremomela builds a cup-shaped nest of leaves and silk low in a bush or tree.

The female alone builds the nest, which is deep and cup-shaped, woven of twigs and grasses with other plant material, animal hair and spider webs.

Using bits of cobwebs, bark, and lichen, the female bee hummingbird builds a cup-shaped nest that is only about 1 inch ( 2. 5 cm ) in diameter.

It builds a solid but sparsely lined cup-shaped stick nest in a tree and lays two white eggs.