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"Ceratorhina monocerata. Unicorn Auk. Horn-bill Auk. Adults in summer: Bill orange-yellow. Culmen and base of upper mandible dusky; feet some yellow color, the tarsi behind and the soles blackish; claws black. The sharp feathers of the head white, about an inch long. Entire upper parts glossy blue-black; a line of white along edge of forearm. Sides of head and neck, of body along under the wings, with chin, throat, and fore-breast, clear grayish-ash, or pale bluish-gray; under parts from breast pure white, shading insensibly into the color of the sides and flanks. Inner webs of wing- and tail-feathers grayish-brown, paler toward base, the shafts of the primaries dull whitish at base." Elliot Coues, 1884

Horn-billed Auk in Summer

"Ceratorhina monocerata. Unicorn Auk. Horn-bill Auk. Adults in summer: Bill orange-yellow. Culmen and…

"Ceratorhina monocerata. Unicorn Auk. Horn-bill Auk. In winter: Bill orange-yellow. Culmen and base of upper mandible dusky; feet some yellow color, the tarsi behind and the soles blackish; claws black. The sharp feathers of the head white, about an inch long. Entire upper parts glossy blue-black; a line of white along edge of forearm. Sides of head and neck, of body along under the wings, with chin, throat, and fore-breast, clear grayish-ash, or pale bluish-gray; under parts from breast pure white, shading insensibly into the color of the sides and flanks. Inner webs of wing- and tail-feathers grayish-brown, paler toward base, the shafts of the primaries dull whitish at base." Elliot Coues, 1884

Horn-billed Auk in Winter

"Ceratorhina monocerata. Unicorn Auk. Horn-bill Auk. In winter: Bill orange-yellow. Culmen and base…

"Ceratorhina monocerata. Unicorn Auk. Horn-bill Auk. Young: Bill like that of adults in winter, lacking horn, but every way weaker, hardly more than half as large. Mostly dark-colored. No white feathers on side of head. White under parts overlaid and marbled with dark-gray ends of the feathers; black of upper parts brownish. The first spring the horn grows, the accessory piece develops, and the plumage clears up. Nestlings are covered with smoky-brown down." Elliot Coues, 1884

Young Horn-billed Auk

"Ceratorhina monocerata. Unicorn Auk. Horn-bill Auk. Young: Bill like that of adults in winter, lacking…

"Speotyto. Burrowing Owls. tarsi long, about twice as long as the middle toe without its claw, very scant-feathered in front, bare behind; toes bristly. The long slim legs are quite peculiar.

The Beaks and Claws of a Burrowing Owl

"Speotyto. Burrowing Owls. tarsi long, about twice as long as the middle toe without its claw, very…

"Stringops habroptilus, the Kakapo or Tarapo of New Zealand has sap-green upper parts, with yellow middles to the feathers and transverse brown markings; yellower lower surface; and browner cheeks, remiges, and rectrices. The soft plumage, the disc of feathers round the eye, and the nocturnal habits have given this bird the name Owl-Parrot." A. H. Evans, 1900

Kakapo

"Stringops habroptilus, the Kakapo or Tarapo of New Zealand has sap-green upper parts, with yellow middles…

Owls are found on nearly every continent.

Owl

Owls are found on nearly every continent.

An adult owl being mobbed by a group of smaller birds. Mobbing occurs when smaller birds, in fear, will swarm in an attack other birds.

The Mobbing of an Owl

An adult owl being mobbed by a group of smaller birds. Mobbing occurs when smaller birds, in fear, will…

"Strix nebulosa. Barred Owl. Hoot Owl. American Wood Owl. Toes fully feathered, nearly or quite to the claws, which are blackish; bill yellow; iris black. Of medium size in this genus. Markings of back and breast in cross-bars, of belly in lengthwise stripes. Above, umber-brown or liver-color, everywhere with white or tawny, or both; breast the same; on the belly the pattern changing abruptly to heavy dusky shaft-stripes on a white or tawny ground; crissum the same; feet speckled with dusky; wings and tail like the back or rather darker, regularly barred with gray, light brown or tawny, some of the bars usually making white spots at their ends, and the markings of the wing-coverts rather in spots than bars. Lining of wings tawny, with some dusky spotting. Facial disc set in a frame of black and white specks, with blackened eye-lids, and obscurely watered with lighter and darker colors in rings around the eye as a centre, the bristly feathers about the bill mixed black and white, or white at base, blackened terminally. A notably large and somewhat impressive owl of Eastern North America, common in woodland of the U.S. especially southerly; not known to range much north of the U.S. though occurring in parts of Canada, and not reported from the West, where apparently replaced by S. occidentalis." Elliot Coues, 1884

Barred Owl

"Strix nebulosa. Barred Owl. Hoot Owl. American Wood Owl. Toes fully feathered, nearly or quite to the…

"Speotyto cunicularia, the Burrowing Owl, a comparatively long-legged and short -winged bird with incomplete facial discs and unfeathered toes, is umber-brown varied with yellowish and white, the lower parts becoming lighter." A. H. Evans

Two Burrowing Owls by the Mountains

"Speotyto cunicularia, the Burrowing Owl, a comparatively long-legged and short -winged bird with incomplete…

"Bubo virginianus. Great Horned Owl. Hoot Owl. Cat Owl. Distinguished by its large size and conspicuous ear-tufts, our other species of similar stature being tuftless or nearly so. Plumage varying interminably, no concise description meeting all its phases. A white collar on the throat is the most constant color-mark. On the upper parts, the under-plumage tawny, but so overlaid with course mottling of blackish and white, that it shows chiefly on the head, nape, and scapulars; the mottling chiefly transverse, and resolving into 7-9 continuous or broken bars on the wings and tail. Under parts white, indefinitely tawny-tinged, and for the most part barred crosswise with blackish, changing on the fore breast to ragged and rather lengthwise blotches. Feathering of feet nearly plain tawny. Ear-tufts black and tawny; a dark mark over eye; border of the facial disc black, the face white or tawny, but the feathers mostly black shafted. Bill and claws black; iris yellow; pupil always circular; when fully dilated as large as a finger-ring, contractile to the size of a pea." Elliot Coues, 1884

Great Horned Owl

"Bubo virginianus. Great Horned Owl. Hoot Owl. Cat Owl. Distinguished by its large size and conspicuous…

"Surnia funerea. American Hawk Owl. Day Owl. Bill and eyes yellow; claws brownish-black. Upper parts bistre-brown, darkest and almost blackish on the head, where profusely spotted with small round white mark, to which succeeds a nuchal interval less spotted or free from spots, then an area of larger and lengthened spots; scapulars profusely spotted with white in large pattern, forming a scapular bar as in Scops; back and wing-coverts more or less spotted with white also; primaries and secondaries with with white spots in pairs on opposite edges of the feathers. Tail broken-barred with white or pale gray, usually narrowly and distinctly, on one or both webs, and tipped with the same; but there is great individual variation in this respect, as may also be said of the amount and character of the spotting of the upper parts. Under parts from the breast backward, including the crissum, closely and regularly cross-barred with rich reddish-brown, or even reddish-brown, or even reddish-black, upon a white ground, the alternating bars of color usually of about equal widths - if anything, the white the broadest.

Hawk Owl

"Surnia funerea. American Hawk Owl. Day Owl. Bill and eyes yellow; claws brownish-black. Upper parts…

Strix flammea, the nocturnal White Screech-, or Barn Owl, is orange-buff above, with brown, grey and white markings, but is white below and on the complete facial discs. The dark grey phase has white parts tinged with orange and a few distinct blackish spots beneath. The legs are entirely, and the toes partially, covered with bristly feathers." A. H. Evens, 1900

Screech Owl

Strix flammea, the nocturnal White Screech-, or Barn Owl, is orange-buff above, with brown, grey and…

Scops. Little Horned Owls. Screech Owls. Like the miniature Bubo in form (all our species under a foot long). Skull and ear-parts symmetrical; latter small, simply elliptical, with rudimentry operculum; facial disc moderately developed; plumicorns evident; nostrils at edge of cere, which is not inflated, and shorter than the rest of the culmen. Wings rounded, but long, about twice the length of the short rounded tail, about to the end which they fold; in our species the 4th and 5th primaries longest, the 1st quite short; 3 or 4 outer primaries sinuate or emarginate on inner webs. Tarsus feathered (in our species), but toes only partly bristly (in the S. asio group) or quite naked (as in S. Flammeola). Plumage dichromatic in some cases; i.e. some individuals of the same species normally mottled gray, while others are reddish, the two phases very distinct when fully developed, but shading insensibly into each other, and entirely independent of age, season, or sex. In normal plumage, a white or whitish scapular stripe; lower parts with lengthwise blotches or shaft-lines and crosswise bars or waves of blackish or dark colors; upper parts with black or blackish shaft-lines on a finely-dappled brown or gray ground (more or less obliterated in the red phase); facial disc black-bordered nearly all around; wing-quills spotted or marbled on outer webs, barred on inner webs. Tail with light and dark bars. A large and nearly cosmopolitan genus, especially rich in tropical species; but only two are known to inhabit N. Am. one of them running into several local races very difficult to characterize satisfactorily." Elliot Coues, 1884

Screech Owl

Scops. Little Horned Owls. Screech Owls. Like the miniature Bubo in form (all our species under a foot…

"Asio accipitrinus. Short-eared Owl. Marsh Owl. Ear-tufts inconspicuous, much shorter than middle toe and claw, few-feathered. First and 2d primaries emarginate on inner webs. Above, completely variegated, chiefly in streaks, with fulvous or tawny, and dark brown; breast much the same, but other under parts paler ochrey, usually bleaching on the belly, which in sparely but sharply streaked (never barred) with dark brown; feet pale tawny or whitish, usually immaculate; lining of wings interruptedly whitish. Wing-quills varied, mostly in large pattern, and tail pretty regularly barred (about 5 bars) with the two colors of the upper parts. Facial area white or nearly so, but with a large black eye-patch; the disc minutely speckled with fulvous and blackish, bordered with white internally and usually having a blackish patch behind the ear; radiating feathers of the oper-culum streaked with blackish and fulvous. Iris bright yellow; bill and claws dusky-bluish; the naked granular soles yellowish. The ear-opening of this species is extremely large, being two inches or more across the longest way." Elliot Coues, 1884

Short-eared Owl

"Asio accipitrinus. Short-eared Owl. Marsh Owl. Ear-tufts inconspicuous, much shorter than middle toe…

"Aluco flammeus pratincola. Barn Owl. above, including upper surfaces of wings and tail, tawny, fulvous, or orange-brown delicately clouded or marbled with ashy and white, and dotted with blackish, sometimes also with white; suck marking resolved, or tending to resolve, into four or five bars of dark mottling on the wings and tail. below, including lining of wings, varying from pure white to tawny, ochrey, or fulvous, but usually paler than the upper parts and dotted with small but distinct blackish specks. Face varying from white to fulvous or purplish-brown, in some shades as if stained with claret, usually quite dark or even black. About the eyes, and the border of the disc, dark brown. Thus extremely variable in tone of coloration, but the pattern more constant, while the generic characters render the bird unmistakable. Nestlings are covered with fluffy white down." Elliot Coues, 1884

Small Barn Owls

"Aluco flammeus pratincola. Barn Owl. above, including upper surfaces of wings and tail, tawny, fulvous,…

"Aluco flammeus pratincola. Barn Owl. above, including upper surfaces of wings and tail, tawny, fulvous, or orange-brown delicately clouded or marbled with ashy and white, and dotted with blackish, sometimes also with white; suck marking resolved, or tending to resolve, into four or five bars of dark mottling on the wings and tail. below, including lining of wings, varying from pure white to tawny, ochrey, or fulvous, but usually paler than the upper parts and dotted with small but distinct blackish specks. Face varying from white to fulvous or purplish-brown, in some shades as if stained with claret, usually quite dark or even black. About the eyes, and the border of the disc, dark brown. Thus extremely variable in tone of coloration, but the pattern more constant, while the generic characters render the bird unmistakable. Nestlings are covered with fluffy white down." Elliot Coues, 1884

Barn Owls

"Aluco flammeus pratincola. Barn Owl. above, including upper surfaces of wings and tail, tawny, fulvous,…

"Nyctala - Saw-whet Owls. Skull and ear-parts highly unsymmetrical, the the latter of great size, and fully operculate. Head very large (as in Strix), without plumicorns; facial disc complete, with centric eye. Nostril at edge of the cere, which is inflated or not. Tail from 1/2 to 2/3rds as long as the wing, rounded. Third and 4th primaries longest; 1st quite short; 2 or 3 emarginate on inner webs. Feet thickly and closely feathered to the claws. In this interesting genus the ear-parts are of great size, and reach the extreme of asymmetry, the whole skull seeming misshapen." Glaucidium. Gnome Owls. Sparrow Owls. Pygmy owls. Size very small. Head perfectly smooth; no plumicorns; ear-parts small, non-operculate; facial disc very incomplete, the eye not centric. Nostril circular, opening in the tumid cere; bill robust. Tarsus fully and closely feathered, but toes only bristly for the most part. Wings short and much rounded, the 4th primary longest, the 1st quite short, the 3 outer ones emarginate, and next one or two sinuate. Tail long, about 3/4ths as long as the wing, even or nearly so. Claws strong, much curved. A large genus of very small owls, mostly of tropical countries. The numerous species, chiefly of warm parts of America, are in dire confusion, but the only two known to inhabit N. Am. are well determined. The plumage of many or most species is dichromatic, as in Scops, there being a red and a gray phase independently of age, season, or sex; but the red is not known to occur in our G. gnoma. The upper parts are marked with spots or lines; bars, or rows of spots, cross the wings and tail; the under parts are streaked; there is a cervical collar." Elliot Coues, 1884

Saw-whet and Sparrow Owls

"Nyctala - Saw-whet Owls. Skull and ear-parts highly unsymmetrical, the the latter of great size, and…

"Scops. Little Horned Owls. Screech Owls. Like the miniature Bubo in form (all our species under a foot long). Skull and ear-parts symmetrical; latter small, simply elliptical, with rudimentry operculum; facial disc moderately developed; plumicorns evident; nostrils at edge of cere, which is not inflated, and shorter than the rest of the culmen. Wings rounded, but long, about twice the length of the short rounded tail, about to the end which they fold; in our species the 4th and 5th primaries longest, the 1st quite short; 3 or 4 outer primaries sinuate or emarginate on inner webs. Tarsus feathered (in our species), but toes only partly bristly (in the S. asio group) or quite naked (as in S. Flammeola). Plumage dichromatic in some cases; i.e. some individuals of the same species normally mottled gray, while others are reddish, the two phases very distinct when fully developed, but shading insensibly into each other, and entirely independent of age, season, or sex. In normal plumage, a white or whitish scapular stripe; lower parts with lengthwise blotches or shaft-lines and crosswise bars or waves of blackish or dark colors; upper parts with black or blackish shaft-lines on a finely-dappled brown or gray ground (more or less obliterated in the red phase); facial disc black-bordered nearly all around; wing-quills spotted or marbled on outer webs, barred on inner webs. Tail with light and dark bars. A large and nearly cosmopolitan genus, especially rich in tropical species; but only two are known to inhabit N. Am. one of them running into several local races very difficult to characterize satisfactorily." Elliot Coues, 1884

Screech Owls

"Scops. Little Horned Owls. Screech Owls. Like the miniature Bubo in form (all our species under a foot…

"Cymochorea leucorrhoa. Leach's Petrel. White-rumped Petrel. Coloration as in the last species (pygmy petrel), with white upper tail-coverts, forming a conspicuous mark; but apt to be lighter - rather of a grayish or even ashy hue on some parts; but easily recognized, whatever the shade of color. Bill and feet black; iris brown." Elliot Coues, 1884

Leach's Petrel

"Cymochorea leucorrhoa. Leach's Petrel. White-rumped Petrel. Coloration as in the last species (pygmy…