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"Heterocercal tail of Acipenser. a, fulcra; b, osseous bucklers." — Encyclopedia Britannica, 1893

Acipenser

"Heterocercal tail of Acipenser. a, fulcra; b, osseous bucklers." — Encyclopedia Britannica, 1893

Native to South America, the tricolored alectrurus measures only six inches in length.

Tricolored Alectrurus

Native to South America, the tricolored alectrurus measures only six inches in length.

"A genus of plants of the natural order Ranunculaceae, having an involucre of three divided leaves, more or less remote from the flower, a petaloid calyx, searcely distinguishable from the corolla, and soft woolly achenia, which in some species have tails." — Chambers' Encyclopedia, 1875

Anemone Coronaria

"A genus of plants of the natural order Ranunculaceae, having an involucre of three divided leaves,…

"fig. 25 - Topography of a Bird. 1, forehead (frons). 2, lore. 3, circumocular region. 4, crown (vertex). 5, eye. 6, hind head (occiput). 7, nape (nucha). 8, hind neck (cervix). 9, side of neck. 10, interscapular region. 11, dorsum, or back proper, including 10. 12, notaeum, or upper part of body proper, including 10, 11, and 13. 13, rump (uropygium). 14, upper tail-coverts. 15, tail. 16, under tail-coverts (crissum). 17, tarsus. 18, abdomen. 19, hind toe (hallux). 20, gastraeum, including 18 and 24. 21, outer and fourth toe. 22, middle and third toe. 23, side of the body. 24, breast (pectus). 25, primaries. 26, secondaries. 27, tertiaries; nos. 25, 26, 27 are all coverts. 28, primary coverts. 29, alula, or bastard wing. 30, greater coverts. 31, median coverts. 32, lesser coverts. 33, the "throat," including 34, 37, 38. 34, jugulum or lower throat. 35, auriculars. 36, malar region. 37, gula, or middle throat. 38, mentum, or chin. 39, angle of commissure, or corner of mouth. 40, ramus of under mandible. 41, side of under mandible. 42, gonys. 43, apex, or tip of bill. 44, tomia, or cutting edges of the bill. 45, culmen, or ridge of upper mandible, corresponding to gonys. 46, side of upper mandible. 47, nostril. 48, passes across the bill a little in front of it base." Elliot Coues, 1884

Topography of a Bird

"fig. 25 - Topography of a Bird. 1, forehead (frons). 2, lore. 3, circumocular region. 4, crown (vertex).…

An illustration of a black cat sitting with its tail curled.

Black Cat Sitting

An illustration of a black cat sitting with its tail curled.

"A. Pelvis and bones of the leg of the Leon or Diver; i, Innominate bone; f, Thighbone (femur); r, Tibia; r, Fibula, together forming the shank; m, Tarso-metatarsus; p Phalanges of the toes. B, Tail of the Golden Eagle; s, Ploughshare-shaped bone, carrying the great tail-feathers." — Winston's Encyclopedia, 1919

Diver Bones

"A. Pelvis and bones of the leg of the Leon or Diver; i, Innominate bone; f, Thighbone (femur); r, Tibia;…

An illustration of a small dog holding a fan with its tail.

Dog with Fan

An illustration of a small dog holding a fan with its tail.

"The tail being extricated." — Encyclopedia Britannica, 1893

Dragonfly

"The tail being extricated." — Encyclopedia Britannica, 1893

"The whole body extricated." — Encyclopedia Britannica, 1893

Dragonfly

"The whole body extricated." — Encyclopedia Britannica, 1893

"The perfect insect (the wings having acquired their full dimensions) resting to dry itself, preparatory to the wings being horizon tally extended." — Encyclopedia Britannica, 1893

Dragonfly

"The perfect insect (the wings having acquired their full dimensions) resting to dry itself, preparatory…

The Mandarin duck, also known as the Chinese teal and the fan-tail duck, is domesticated in China and Japan.

Mandarin Duck

The Mandarin duck, also known as the Chinese teal and the fan-tail duck, is domesticated in China and…

Found in the southern United States, the Savannah fly-catcher is notable for its long, forked tail.

Savannah Flycatcher

Found in the southern United States, the Savannah fly-catcher is notable for its long, forked tail.

Nearing the end of its development, a gradually shrinking tail is all that remains of the tadpole.

Frog with tail

Nearing the end of its development, a gradually shrinking tail is all that remains of the tadpole.

"Hand-vices are used in the manner implied by their name, without being attached to a bench like the foregoing." — Encyclopedia Britannica, 1893

Hand-Vice

"Hand-vices are used in the manner implied by their name, without being attached to a bench like the…

"One of the numberless microscopic bodies contained in semen, to which the seminal fluid owes its vitality, and which are the immediate and active means of impregnating or fertilizing the ovum of the female... I. broadest view; II. profile, of k, kernel or nucleus of the head, and m, filamentous body, ending in s, the long slender tail." —Whitney, 1889

Human Spermatozoa

"One of the numberless microscopic bodies contained in semen, to which the seminal fluid owes its vitality,…

"The fork-tailed kite, (<em>N. furcatus</em>) is twenty-five inches long; the wings and tail black; neck and under parts white; the tail-feathers, twelve in number, are deeply forked, the lateral ones excessively elongated. It feeds on snakes, lizards, and frogs ; it also devours grasshoppers, locusts, and wasps, making attacks on the nests of the latter. This species is common in the South and Southwestern States, and also in the Western States, as far north as Wisconsin." &mdash Goodrich, 1859

Fork-Tailed Kite

"The fork-tailed kite, (N. furcatus) is twenty-five inches long; the wings and tail black;…

"Terrestril Rodents, with imperfect clavicles, elongated hind limbs, short recurved tail, and long ears. Skull compressed, frontals with large wing-shaped post-orbital processes; molars as in Lagomyidae." &mdash;The Encyclopedia Britannica, 1903

Lepus Timidus

"Terrestril Rodents, with imperfect clavicles, elongated hind limbs, short recurved tail, and long ears.…

"The English parallel vice is little used except for small work." — Encyclopedia Britannica, 1893

Parallel Vice

"The English parallel vice is little used except for small work." — Encyclopedia Britannica, 1893

"Plumage of Bird. Bohemian Chatterer (Bombycilla garrula). a, primaries; b, secondaries; c, coverts; d, scapulars; e, tail feathers; f, forehead; g, sinciput; h, occiput." &mdash; Winston's Encyclopedia, 1919

Plumage of Bird

"Plumage of Bird. Bohemian Chatterer (Bombycilla garrula). a, primaries; b, secondaries; c, coverts;…

The father of Reynard the Fox sweeps the dirt with his tail over the hole where he hides his newfound treasure.

Reynard the Fox: Covering the Treasure

The father of Reynard the Fox sweeps the dirt with his tail over the hole where he hides his newfound…

Reynard the Fox teaches Ereswine the wolf to fish with her tail. She fishes so long that her tail freezes in the frozen lake.

Reynard the Fox: Tricking Ereswine at the Lake

Reynard the Fox teaches Ereswine the wolf to fish with her tail. She fishes so long that her tail freezes…

"On the continent of Europe the <em>Sirex gigas</em> often appears in immense numbers, and does great damage in this way." &mdash; Goodrich, 1859

Sawfly

"On the continent of Europe the Sirex gigas often appears in immense numbers, and does great…

A common shrimp, a genus of the decapod Crustacea.

Shrimp

A common shrimp, a genus of the decapod Crustacea.

"One of the numberless microscopic bodies contained in semen, to which the seminal fluid owes its vitality, and which are the immediate and active means of impregnating or fertilizing the ovum of the female... I. broadest view; II. profile, of k, kernel or nucleus of the head, and m, filamentous body, ending in s, the long slender tail." &mdash;Whitney, 1889 <p>Illustration of two spermatozoa from an ape.

Spermatozoa of an Ape

"One of the numberless microscopic bodies contained in semen, to which the seminal fluid owes its vitality,…

An illustration of the tail of a horse.

Horse Tail

An illustration of the tail of a horse.

"The ordinary tail-vice used by mechanics has not yet been largely superseded, though many ingenious arrangements have been devised for remedying its main defect." &mdash; Encyclopedia Britannica, 1893

Tail-vice

"The ordinary tail-vice used by mechanics has not yet been largely superseded, though many ingenious…

"Generic details of a Myiadestes townsendi (Townsend's Flycatching Thrush); bill and foot nat. size, wing and tail 3/4ths."

Generic Details of a Thrush

"Generic details of a Myiadestes townsendi (Townsend's Flycatching Thrush); bill and foot nat. size,…

Notable for its lengthy tail-feathers, the tropic bird inhabits the tropical regions of the Atlantic Ocean.

Tropicbird

Notable for its lengthy tail-feathers, the tropic bird inhabits the tropical regions of the Atlantic…