"Strix nebulosa. Barred Owl. Hoot Owl. American Wood Owl. Toes fully feathered, nearly or quite to the…
"Nyctea scandiaca. Snowy Owl. Pure white, spotted and barred with brownish-black markings, wholly indeterminate…
"Surnia funerea. American Hawk Owl. Day Owl. Bill and eyes yellow; claws brownish-black. Upper parts…
"Nyctala - Saw-whet Owls. Skull and ear-parts highly unsymmetrical, the the latter of great size, and…
"Speotyto. Burrowing Owls. tarsi long, about twice as long as the middle toe without its claw, very…
"Aluco flammeus pratincola. Barn Owl. above, including upper surfaces of wings and tail, tawny, fulvous,…
"Speotyto cunicularia hypogae'a. Burrowing Owl. Adult: Above, dull grayish-brown, profusely spotted…
"Circus cyaneus hudsonius. American Marsh Hawk, Harrier. Blue hawk. Adult Male: In perfect plumage pale…
"Owing to the rarity and expensiveness of free-stone in Upper Italy, an architectural style in brick…
The Villa Farnese, also known as Palazzo Farnese or Villa Caprarola, is a mansion in the town of Caprarola…
"Circinae. Harriers. Face surrounded with an incomplete ruff (as in most owls); orifice of ear about…
"Elanoides forficatus. Swallow-tailed Kite. Adult: Head, neck, band on rump, and entire under parts,…
Two Swallow-tail and One Mississippi Kite. "Ictinia subcaerulea. Mississippi Kite. General plumage plumbeous…
"Accipiter fuscus. Sharp-shinned Hawk. "Pigeon" Hawk. Above, dark plumbeous, slate-color, or bluish-gray,…
"Accipiter fuscus. Sharp-shinned Hawk. "Pigeon" Hawk. Above, dark plumbeous, slate-color, or bluish-gray,…
"Ideal plan of the double-ringed body of a vertebrate. N, neural canal; H, haemal canal; the body separating…
"Fig 55. - Actual section of the body in the thoracic region of a bird. N, neural canal; H, haemal canal;…
"Astur atricapillus. American Goshawk. Blue Hen Hawk (adult). Chicken Hawk (young). Adult: Above, dark…
"Falco mexicanus. American Lanner Falcon. Prairie Flacon. A medium-sized species, distinguished from…
"Falco mexicanus. American Lanner Falcon. Prairie Flacon. A medium-sized species, distinguished from…
"Falco peregrinus. Peregrine Falcon. Duck Hawk. Great-footed Hawk. A medium-sized falcon, about as large…
"Falco peregrinus. Peregrine Falcon. Duck Hawk. Great-footed Hawk. A medium-sized falcon, about as large…
"Falco sparverius. Rusty-crowned Falcon. Sparrow Hawk. Adults: Crown ashy-blue, with a chestnut patch,…
"Polyborus auduboni. Common Caracara. General color blackish, the throat, neck all around, and more…
"Buteo borealis. Red-tailed Buzzard. "Hen Hawk". Upper surface of tail rich chestnut, with white tip…
An Osprey catching a fish. "Pandion haliaetus. Fish Hawk. Osprey. Adult. dark vandyke- brown, blackening…
"Ectopistes migratorius. Passenger Pigeon. Wild Pigeon Adult: Upper parts, including head all around,…
"Canace canadensis. Canada Grouse. Spotted Grouse. Spruce Grouse. Spruce "Partridge." Adult: Head smooth,…
"Pediaecetes phasianellus Columbianus. Common Sharp-tailed Grouse. Upper parts closely and pretty evenly…
"Details of Engyptila albifrons (White-fronted Dove); head and foot natural size; wing and tail reduced.
"Cupidonia. Tarsi scant-feathered to the toes in front and on sides, bare on a strip behind; toes extensively…
"Lagopus albus. Willow Grouse. Willow Ptarmigan. Bill very stout and convex, its depth at base as the…
"Lagopus leucurus. White-tailed Ptarmigan. Rocky Mountain Snow Grouse. Male and Female in winter: Entirely…
"Ortyx. Quail. Outstretched feet reaching beyond end of tail. Bill black or blackish-brown. " Elliot…
"Ortyx virginiana. Virginia Partridge or "Quail". Bobwhite. Male: Forehead, superciliary line, and throat,…
"Ortyx virginiana. Virginia Partridge or "Quail". Bobwhite. Male: Forehead, superciliary line, and throat,…
"Fig 64 - Skull of chick, fifth day of incubation, x 9 diameters. Seen from above, the membranous roof…
"Skull of a chick, but seen from below. cv1, anterior cerebral vesicle; e, eye; m, mouth; pts, pituitary…
"Fig 66 - Head of a chick, second stage, after five days of incubation, section in profile; x6 diameters.…
"Orortyx picta. Plumed Partridge. Mountain Quail. Back, wings and tail olive-brown, the inner secondaries…
"Lophortyx gambeli. Gambel's Partridge. Arizona Quail. Male: Without white loral line; forehead black…
"Lophortyx californica. Californian Partridge. Valley Quail. Male: With a small white line from bill…
"Cyrtonyx massena. Massena Partridge. Male: Upper parts intimately waved with black and reddish-brown…
"Coturnix dactylisonans. Messina Quail. Migratory Quail. Common Quail of Europe. Upper parts variegated…
"Squatarola helvetica. Swiss Plover. Black-bellied Plover. Bull-head Plover. Whistling Field Plover.…
"Squatarola. Four-toed Plover. A small but distinct hind toe, contrary to the rule in this family. Tail…
"Charadrius dominicus. American Golden Plover. Field Plover. Bull-head Plover. Upper parts black, everywhere…
"Aegialites vociferus. Kildeer Plover. Above, grayish-brown, with an olive shade, and in high plumage…
"Haematopus. Oyster-catcher. Bill peculiar - longer than tarsus, twice as long as head, constricted…
"Haematopus ostrilegus. European Oyster-catcher. (oyster-opener would b a better name, as oysters do…
"Strepsilas interpres. Turnstone. Brant Bird. Calico-back. Pied above with black, white, brown, and…
"Another small family, characterized by the extreme length of the slender legs, and the extreme slenderness…
The Palazzo Pitti, in English sometimes called the Pitti Palace, is a vast mainly Renaissance palace…
"The change from the pure to the later Renaissance, which was formerly seen only in individual instances,…
Acacia estrophiolata, commonly known as the Ironwood or Southern Ironwood, is a tree native to Central…
An illustration of erysiphe communis, powdery mildew, that is on the epidermis of the leaf of the flower,…
An illustration of the sporocarp and mycelium of powdery mildew.
An illustration of powdery mildew showing conidia bearing hypha.
An illustration of powdery mildew showing the ascus containig eight ascospores.