ClipArt ETC
Olfactory and supporting cells in a frog and a human. A. Frog. B. Human. C. Human.

Olfactory and Supporting Cells

Olfactory and supporting cells in a frog and a human. A. Frog. B. Human. C. Human.

Diagrammatic section of the human retina.

Section of Retina

Diagrammatic section of the human retina.

A. A cone and two rods from the human retina (modified from Max Schultze); B. Outer part of rod separated into discs.

Cones and Rods of Retina

A. A cone and two rods from the human retina (modified from Max Schultze); B. Outer part of rod separated…

Pigment epithelium of human retina (viewed from the surface).

Pigment Epithelium of Retina

Pigment epithelium of human retina (viewed from the surface).

Transverse section of human semicircular canal.

Section of Semicircular Canals

Transverse section of human semicircular canal.

A, Left labyrinth of a human embryo of about four weeks; B, left labyrinth of a human embryo of about 5 weeks.

Development of Labyrinth

A, Left labyrinth of a human embryo of about four weeks; B, left labyrinth of a human embryo of about…

A, Section through papilla vallata of a human tongue. B, Section through part of the papilla foliata of a rabbit. Labels: 1, papilla; 2, vallum; 3, taste buds; 4, papillae; 5, taste buds; 6, ducts of serous gland.

Tongue of Human and Rabbit

A, Section through papilla vallata of a human tongue. B, Section through part of the papilla foliata…

An illustration of the "ailmentary canal of Bluebird, reduced; after Audobon. a,b, gullet or oesophagus; c, proventriculus; d, gizzard; e, f, h, intestine; i, cloaca" (Forbush, 1907).

Ailmentary Canal of Bluebird

An illustration of the "ailmentary canal of Bluebird, reduced; after Audobon. a,b, gullet or oesophagus;…

"Saurognathous skull of woodpecker (Colaptes auratus). v, v, the posterior parts of the abortive vomer; s, point of sphenoid; mxp, maxillopalatine; pt, pterygoid; me, ossified mesethmoid; pl, palatine; q, quadrate; bt, basitemporal; fm, foramen magnum. The posterior part of one palatine is cut away to show the long anterior projection of the pterygoid." -Whitney, 1911

Woodpecker Skull

"Saurognathous skull of woodpecker (Colaptes auratus). v, v, the posterior parts of the abortive vomer;…

The bat genus Nyctalus (Noctule bats) are Evening bats. They are distributed in the temperate and subtropical areas of Europe, Asia and North Africa.

Skeleton and Wing Membranes of the Noctule Bat

The bat genus Nyctalus (Noctule bats) are Evening bats. They are distributed in the temperate and subtropical…

An illustration of a male (right) and female (left) cockroach. Cockroaches (or simply "roaches") are insects of the order Blattaria. This name derives from the Latin word for "cockroach", blatta. There are about 4,000 species of cockroach of which 30 species are associated with human habitations and about four species are well known as pests.

Cockroach

An illustration of a male (right) and female (left) cockroach. Cockroaches (or simply "roaches") are…

"Palmar aspect of left fore foot of a black bear (Ursus americanus). scl, scapholunar; c, cuneiform; p, pisiform; tr, trapezium; t, trapezoid; m, magnum; u, unciform. The phalanges show a full series of sesamoid bones (unmarked)." -Whitney, 1911

Bear Foot

"Palmar aspect of left fore foot of a black bear (Ursus americanus). scl, scapholunar; c, cuneiform;…

"Right shoulder-girdle or scapular arch of fowl, showing hp, the hypoclidium; f, furculum; Co, coracoid; Sc, scapula; gl, glenoid." -Whitney, 1911

Bird Scapula

"Right shoulder-girdle or scapular arch of fowl, showing hp, the hypoclidium; f, furculum; Co, coracoid;…

"Pectoral arch and fore limb of the pike (Esox lucius), an osseous fish, showing scapulocoracoid, composed of Scp, scapula or hypercoracoid; c, posterior end of the outer margin of the scapulocoracoid; b, b, 1, 2, 3, 4, 5, five fin-rays or radialia; a, actinosts or basalia." -Whitney, 1911

Pike Scapulocoracoid

"Pectoral arch and fore limb of the pike (Esox lucius), an osseous fish, showing scapulocoracoid, composed…

Watercresses are fast-growing, aquatic or semi-aquatic, perennial plants native from Europe to central Asia, and one of the oldest known leaf vegetables consumed by human beings. These plants are members of the Family Brassicaceae or cabbage family, botanically related to garden cress and mustard — all noteworthy for a peppery, tangy flavor.

Watercress

Watercresses are fast-growing, aquatic or semi-aquatic, perennial plants native from Europe to central…

The American Harpy Eagle (Harpia harpyja) is a neotropical eagle, often simply called the Harpy Eagle. It is the only member of the genus Harpia. It is the largest and most powerful raptor found in the Americas, usually inhabiting tropical lowland rainforests in the upper (emergent) canopy layer. Its name references the harpies from Ancient Greek mythology. These were wind spirits that took the dead to Hades, and were said to have a body like an eagle and the face of a human.

American Harpy Eagle

The American Harpy Eagle (Harpia harpyja) is a neotropical eagle, often simply called the Harpy Eagle.…

A Sphinx is a zoomorphic mythological figure which is depicted as a recumbent lion with a human head.

Sphinx

A Sphinx is a zoomorphic mythological figure which is depicted as a recumbent lion with a human head.

"Schizognathous skull of common fowl. pmx, premaxilla; mxp, maxillopalatine; mx, maxilla; pl, palatine; pt, pterygoid; vo, vomer." -Whitney, 1911

Bird Skull

"Schizognathous skull of common fowl. pmx, premaxilla; mxp, maxillopalatine; mx, maxilla; pl, palatine;…

"Schizorhinal skull of curlew (top view), showing the long cleft, a, between upper and lower forks of each nasal bone." -Whitney, 1911

Curlew Skull

"Schizorhinal skull of curlew (top view), showing the long cleft, a, between upper and lower forks of…

"Diagram of plantar aspect of schizopelmous foot of a magpie (Pica caudata), showing the deep plantar tendons, separate from one another and from the superficial tendons. flh, flexor longus hallucis; fpd, flexor perforans digitorum." -Whitney, 1911

Magpie Foot

"Diagram of plantar aspect of schizopelmous foot of a magpie (Pica caudata), showing the deep plantar…

"Sclerotals of eye of bald eagle (Haliaetus leucocephalus)." -Whitney, 1911

Eagle Eye Sclerotal

"Sclerotals of eye of bald eagle (Haliaetus leucocephalus)." -Whitney, 1911

The Black Rock Scorpion (Scorpio (Buthus) Afer), "seen from above. At, the chelicerae, or chelate antennae; the large claws are chelate pedipalpi; Cth, cephalothorax; the first two legs are cephalic appendages, the next two thoracic; Tn, the telson or sting." -Whitney, 1911

Black Rock Scorpion

The Black Rock Scorpion (Scorpio (Buthus) Afer), "seen from above. At, the chelicerae, or chelate antennae;…

"Diagram of structure of Scopionidae (most of the appendages removed). IV. to XX., fourth to twentieth somite; IV., basis of the pedipalpi or great claws; V., VI., of two succeeding cephalic segments; T, telson of sting; a, mouth; b, alimentary canal; c, anus; d, heart; e, a pulmonary sac; f, line of ventral ganglionated cord; g, cerebroganglia." -Whitney, 1911

Scorpion Diagram

"Diagram of structure of Scopionidae (most of the appendages removed). IV. to XX., fourth to twentieth…

"Scutellate. Foot of bluebird, with laminiplantar and mostly booted tarsus and of the toes." -Whitney, 1911

Bluebird Foot

"Scutellate. Foot of bluebird, with laminiplantar and mostly booted tarsus and of the toes." -Whitney,…

"Scutelliplantar foot of horned lark: the tarsus scutellate before and behind, and the toes all scutellate on top." -Whitney, 1911

Lark Foot

"Scutelliplantar foot of horned lark: the tarsus scutellate before and behind, and the toes all scutellate…

An illustration of a bird skeleton.

Bird Skeleton

An illustration of a bird skeleton.

An illustration of a fossil containing Chirotherium tracks. Chirotherium (also known as Cheirotherium) or 'hand-beast', is the name of a creature which may be known only from fossil imprints of its tracks (trace fossils). These look, by coincidence, remarkably like the hand of an ape/human or bear, with the outermost toe having evolved to extend out to the side like a thumb, although probably only providing a firmer grip in mud. Its tracks were first found in 1834, in red sandstone in Thuringia, Germany, dating from 240 million years ago (mya). This creature was probably an archosaur, related to the ancestors of the dinosaurs.

Chirotherium Tracks

An illustration of a fossil containing Chirotherium tracks. Chirotherium (also known as Cheirotherium)…

The securifera or saws of the sawfly (Lophyrus suffusus), an insect related to the wasps and bees.

Securifera

The securifera or saws of the sawfly (Lophyrus suffusus), an insect related to the wasps and bees.

The sedan or litter is a wheelless, human-powered vehicle used to carry one person sitting inside.

Sedan

The sedan or litter is a wheelless, human-powered vehicle used to carry one person sitting inside.

The semipalmate (half-webbed) foot of the willet (Tringa semipalmata).

Willet Foot

The semipalmate (half-webbed) foot of the willet (Tringa semipalmata).

The skeleton of a bird. Labels: a, radius and ulna; b, dorsal vertebrae; c, sacrum and pelvis; g, ploughshare bone; h, tibia; i, metatarsus; d, furculum; e, carina of the sternum; f, distal phalanx of pectoral limb.

Skeleton of a Bird

The skeleton of a bird. Labels: a, radius and ulna; b, dorsal vertebrae; c, sacrum and pelvis; g, ploughshare…

The sternum of a bird. Label: a, lateral aspect; b, inferior aspect; r, rostrum; c.p, costal process; pl.o, pleurosteon; c, carina; m.x, middle xiphoid process.

Sternum of a Bird

The sternum of a bird. Label: a, lateral aspect; b, inferior aspect; r, rostrum; c.p, costal process;…

The skull of a bird. Labels: a, inferior aspect, the mandible being removed; b, lateral aspect; px, premaxilla; mx, superior maxilla; p, palatine bone; v, vomer; j, jugal bone; qj, quadrato-jugal bone; lachrymal; me, median ethmoid; f, frontal; pf, post-frontal process; p, parietal; pt, pterygoid; q, os quadratum; sq, sqamosal; eu, process before the sustachian aperture; bo, basi-occipital, and so, supra-occipital bone; ar, articular; a, surangular, and d, dentary portion of the mandible.

Skull of a Bird

The skull of a bird. Labels: a, inferior aspect, the mandible being removed; b, lateral aspect; px,…

The pectoral arch of a bird. Labels: sc, scapula; co, coracoid bone; f, clavicle, terminating below in the hypocleideum; gl, glenoid cavity.

Pectoral Arch of a Bird

The pectoral arch of a bird. Labels: sc, scapula; co, coracoid bone; f, clavicle, terminating below…

The pelvis of a bird. Labels: a, superior; b, lateral aspect; sm, sacrum; Il, ilium; Is, ischium; Am, acetabulum.

Pelvis of a Bird

The pelvis of a bird. Labels: a, superior; b, lateral aspect; sm, sacrum; Il, ilium; Is, ischium; Am,…

A pixy named Thomas alarmed that a human has just invaded his lawn by jumping over Thomas' wall.

Pixy and a Man

A pixy named Thomas alarmed that a human has just invaded his lawn by jumping over Thomas' wall.

"Frontal Shield of (1) European Gallinule (Gallinula chloropus), (2) American Gallinule (Gallinula galeata)." -Whitney, 1911

Moorhen Frontal Shields

"Frontal Shield of (1) European Gallinule (Gallinula chloropus), (2) American Gallinule (Gallinula galeata)."…

An diagram of the anatomy of a sea urchin. Sea urchins are small, globular, spiny sea creatures, composing most of class Echinoidea. They are found in oceans all over the world. Their shell, or "test", is round and spiny, typically from 3 to 10 cm across. Common colors include black and dull shades of green, olive, brown, purple, and red. They move slowly, feeding mostly on algae. Sea otters, wolf eels, and other predators feed on urchins. Sea urchins are harvested and served as a delicacy.

Sea Urchin

An diagram of the anatomy of a sea urchin. Sea urchins are small, globular, spiny sea creatures, composing…

An illustration of the mouth organs of the stag beetle.

Mouth Organs of a Beetle

An illustration of the mouth organs of the stag beetle.

An illustration of the dorsal view of a stag beetle.

Stag Beetle (Dorsal)

An illustration of the dorsal view of a stag beetle.

An illustrative view of the dissection of he renal organs of a chiton. "F, foot; L, Edge of the mantle not removed in the front part of the specimen; s.o., Oesophagus; af, anus; gg, Genital duct; go, External opening of the same; eg, Stem of the nephridium leading to no, its external aperture; nk, reflected portion of the nephridial stem; ng, Fine caeca of the nephridium, which are seen ramifying transversely over the whole inner surface of the pedal muscular mass." -Britannica, 1910

Dissection of the Renal Organs of a Chiton

An illustrative view of the dissection of he renal organs of a chiton. "F, foot; L, Edge of the mantle…

An illustration of: 1, Coralla cut open showing the four stamens; 2, Unripe fruit (lengthwise); 3, ripe capsule split open; and the foxglove plant. Digitalis is a genus of about 20 species of herbaceous perennials, shrubs, and biennials that are commonly called foxgloves. The genus was traditionally placed in the figwort family Scrophulariaceae, but upon review of phylogenetic research, it has now been placed in the much enlarged family Plantaginaceae. The genus is native to Europe, western and central Asia, and northwestern Africa. The scientific name means "finger-like" and refers to the ease with which a flower of Digitalis purpurea can be fitted over a human fingertip. The flowers are produced on a tall spike, are tubular, and vary in colour with species, from purple to pink, white, and yellow. The best-known species is the Common Foxglove, Digitalis purpurea. It is a biennial, often grown as an ornamental plant due to its showy flowers, that range in colour from purples through to whites, with variable marks and spotting. The first year of growth produces only the long, basal leaves. In the second year, the erect leafy stem 0.5-2.5 m tall develops.

Foxglove

An illustration of: 1, Coralla cut open showing the four stamens; 2, Unripe fruit (lengthwise); 3, ripe…

Corystes cassivelaunus, the masked crab, helmet crab or sand crab, is a burrowing crab of the North Atlantic and North Sea from Portugal to Norway, which also occurs in the Mediterranean Sea. It may grow up to 4 cm long (carapace length). The name "masked crab" derives from the patterns on the carapace which resemble a human face, in a similar manner to heikegani.

Masked Crab

Corystes cassivelaunus, the masked crab, helmet crab or sand crab, is a burrowing crab of the North…

In 1959 an international donations campaign to save the monuments of Nubia began: the southernmost relics of this ancient human civilization were under threat from the rising waters of the Nile that were about to result from the construction of the Aswan High Dam. This image gives a perspective view of the entrance hall, in which are seen eight standing colossal statues 33 feet high, supported by square piers.1

Entrance to the Great Temple at Abu Simbel

In 1959 an international donations campaign to save the monuments of Nubia began: the southernmost relics…

The Sumerian word lama, which is rendered in Akkadian as lamassu, refers to a beneficient protective female deity. The corresponding male deity was called alad, in Akkadian, šêdu. In art they were depicted as hybrids, as winged bulls or lions with the head of a human male (Centauroid). There are still surviving figures of šêdu in bas-relief and some statues in museums. Notable examples of šêdu/lamassu held by museums include those at the British Museum, Musée du Louvre, National Museum of Iraq, Metropolitan Museum of Art and one extremely large example kept at the Oriental Institute, Chicago. They are generally attributed to the ancient Assyrians.

Winged Bull from Nimrud

The Sumerian word lama, which is rendered in Akkadian as lamassu, refers to a beneficient protective…

The end view of the skull of a chicken three weeks old.

Chicken Skull

The end view of the skull of a chicken three weeks old.

A ripe chick's head, 1.25 inches long.

Chick's Head

A ripe chick's head, 1.25 inches long.

The upper view of the skull of an old fowl.

Fowl Skull

The upper view of the skull of an old fowl.

The skull of an adult fowl.

Fowl Skull

The skull of an adult fowl.

The skull of an adult fowl. Here the temporal fossa is bridged over by the junction of the post-frontal and squamosal processes.

Fowl Skull

The skull of an adult fowl. Here the temporal fossa is bridged over by the junction of the post-frontal…

Oshyiodes of an adult fowl.

Oshyiodes of Adult Fowl

Oshyiodes of an adult fowl.

The sacrum of a young fowl; natural size seen from below.

Fowl Sacrum

The sacrum of a young fowl; natural size seen from below.

The sternum of a chick three days old.

Chick Sternum

The sternum of a chick three days old.

The pelvis and caudal vertebrae of an adult fowl.

Fowl Pelvis

The pelvis and caudal vertebrae of an adult fowl.

The wing muscles of a goose.

Goose Wing

The wing muscles of a goose.

Left thigh-muscle of a rail.

Rail Thigh

Left thigh-muscle of a rail.

The human thoracic viscera.

Thoracic Viscera

The human thoracic viscera.

Cavities of the right side of the heart.

Heart Cavities

Cavities of the right side of the heart.

The embryo if an insect, <em>gryllotalpa</em>.

Insect Embryo

The embryo if an insect, gryllotalpa.

"Head-shields of Scinid Lizards. cs, chin-shields; d, disk on lower eylid; e, ear-opening; f, frontal; fn, frontonasal; fp, frontoparietal; i, interparietal; il, lower labials; l, loreals; lb, upper labials; m, mental; n, nasal; nc, nuchals; p, parietals; pf, prefrontal; pn, postnasal; r, rostral; sc, supraciliaries; sn, supranasal; so, supraocular; t, temporal." -Whitney, 1911

Skink Head

"Head-shields of Scinid Lizards. cs, chin-shields; d, disk on lower eylid; e, ear-opening; f, frontal;…