ClipArt ETC
Two young ducks watching an insect being pulled in a wagon by a catapillar.

Catapillar Wagon

Two young ducks watching an insect being pulled in a wagon by a catapillar.

"Fig 66 - Head of a chick, second stage, after five days of incubation, section in profile; x6 diameters. cvl, cv2, cv3, first, second, and third cerebral vesicles; 1, place of the first nerve, the olfactory; 2, place of second nerve, the optic; ic, internal carotid artery, running into skull at what was originally the pituitary space, now an opening bounded in front by the anterior, acl, behind the posterior, pcl, clinoid walls; nc, notochord; oc, occipital condyle, thence to pcl being the original parachordal cartilage, here seen in profile; eo, exoccipital; eth, ethmoid, with ps, its presphenoid region posteriorly, and pn, pre-nasal part; this whole plate afterward developing into parts of the nose and the partition between the eyes; pa, palatine; pg, pterygoid region; pa and pg reference lines are in the chick's mouth; mk meckelian cartilage (lower jaw); ch and bh, ceratohyal and basihyal parts of the hyoid or tongue bone." Elliot Coues, 1884

Chick Head

"Fig 66 - Head of a chick, second stage, after five days of incubation, section in profile; x6 diameters.…

The sternum of a chick three days old.

Chick Sternum

The sternum of a chick three days old.

A ripe chick's head, 1.25 inches long.

Chick's Head

A ripe chick's head, 1.25 inches long.

Diagram showing vascular area in the chick. A, area pellucida; b, area vasculosa; c, area vitellina.

Vascular Area in the Chick

Diagram showing vascular area in the chick. A, area pellucida; b, area vasculosa; c, area vitellina.

The chicken is a domesticated fowl which is commonly used from its meat and eggs.

Chicken

The chicken is a domesticated fowl which is commonly used from its meat and eggs.

An illustration of a mother chick overlooking her baby chicks.

Chicken and Chicks

An illustration of a mother chick overlooking her baby chicks.

An illustration of a mother chick surrounded by her baby chicks.

Chicken and Chicks

An illustration of a mother chick surrounded by her baby chicks.

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.

Bird

Chick

Bird

A chick and eggs

Chick

A chick and eggs

A chick

Chick

A chick

A newly hatched chick, with broken eggshell nearby.

Newly Hatched Chick

A newly hatched chick, with broken eggshell nearby.

A small little chicken modeled out of tissue paper.

Tissue paper chicken

A small little chicken modeled out of tissue paper.

Five baby chickens.

Five Chicks

Five baby chickens.

An illustration of a young girl chasing after a loose chicken.

Child Chasing Chicken

An illustration of a young girl chasing after a loose chicken.

A young curlew.

Young curlew

A young curlew.

Embryo chick (36 hours), viewed from beneath as a transparent object (magnified). Labels:pl, outline of pellucid area; FB, forebrain, or first cerebral vesicle: from its sides project op, the optic vesicles; SO, backward limit of somatopleure fold, "tucked in", under head; A, head-fold of true amnion; a', reflected layer of amnion, sometimes termed "false amnion;" sp, backward limit of splanchnopleure folds, along which run the omphalomesaraic veins uniting to form h, the heart, which is continued forwards into ba, the bulbus arteriosus; d, the foregut, lying behind the heart, and having a wide crescentic opening between the splanchnopleure folds; HB, hindbrain; MB, midbrain; pv, protovertebrae lying behind the foregut; mc, line of junction of medullary folds and of notochord; ch, front end of notochord; vpl, vertebral plated; pr, the primitive groove at its caudal end.

Embryo Chick

Embryo chick (36 hours), viewed from beneath as a transparent object (magnified). Labels:pl, outline…

Embryo chick at fourth day, viewed as a transparent object, lying on its left side. CH, cerebral hemispheres; FB, forebrain or vesicle of third ventricle, with Pn, pineal gland projecting from its summit; MB, midbrain; Cb, cerebellum; IV V, fourth ventricle; L, lens; chs, choroidal slit; Cen V, auditory vesicle; s m, superior maxillary process; 1F, 2F, 3F,4F., first, second, third, and fourth visceral folds; V, fifth nerve, sending one branch (ophthalmic) to the eye, and another to the first pharyngeal nerve, passing to the third visceral arch; G.Pg, pneumogastric nerve, passing towards the fourth visceral arch; iv, investing mass; ch, notochord; its front end cannot be seen in the living embryo, and it does not end as shown in the figure, but takes a sudden bend downwards, and then terminated in a point; Ht, heart seen through the walls of the chest; MP, muscle-plates; W, wing, showing commencing differentiation of segments, corresponding to arm, forearm, and hand; H L, hind-limb, as yet a shapeless bud, showing no differentiation. Beneath it is seen the curved tail.

Embryo Chick at Fourth Day

Embryo chick at fourth day, viewed as a transparent object, lying on its left side. CH, cerebral hemispheres;…

A transverse section through an embryo chick (26 hours). Labels: a, epiblast; b, mesoblast; c, hypoblast; d, central portion of mesoblast, which is here fused with epiblast; e, primitive groove; f, dorsal ridge.

Cells of an Embryo Chick

A transverse section through an embryo chick (26 hours). Labels: a, epiblast; b, mesoblast; c, hypoblast;…

Transverse section of an embryo chick (third day). Labels: mr, rudimentary spinal cord; the primitive central canal has become constricted in the middle; ch, notochords; layer of mesoblast lining groove, which is not yet closed in to form the intestines; a o, one of the primitive aorta, u n, Wolffian body; ung; Wolffian duct; vc, vena cardinalis; h, epiblast; hp, somatopleure and its reflection to form af, amniotic fold; p, pleuroperitoneal cavity.

Transverse Section of an Embryo Chick

Transverse section of an embryo chick (third day). Labels: mr, rudimentary spinal cord; the primitive…

Two adult willow grouses, and a group of chicks.

Willow Grouse

Two adult willow grouses, and a group of chicks.

An illustration of a hawk swooping down to capture a baby chick.

Hawk Capturing a Chick

An illustration of a hawk swooping down to capture a baby chick.

Heart of a chick at the 45th, 65th, and 85th hours of incubation. I, the venous trunks; 2, the auricle; 3, the ventricle; 4, the bulbus arteriosus.

Development of the Heart of a Chick

Heart of a chick at the 45th, 65th, and 85th hours of incubation. I, the venous trunks; 2, the auricle;…

Rudiments of the liver on the intestines of a chick at the fifth day of incubation. Labels: 1, heart; 2, intestine; 3, diverticulum of the intestine in which the liver (4) is developed; 5, part of the mucous layer of the germinal membrane.

Intestine of a Chick

Rudiments of the liver on the intestines of a chick at the fifth day of incubation. Labels: 1, heart;…

A young barn-owl.

Young Barn Owl

A young barn-owl.

A female pelican feeding its young fish.

Pelican feeding its young

A female pelican feeding its young fish.

An illustration of a rooster overlooking three chickens.

Rooster

An illustration of a rooster overlooking three chickens.

"Fig 64 - Skull of chick, fifth day of incubation, x 9 diameters. Seen from above, the membranous roof of the skull and the brain removed. cv1, anterior cerebral vesicle; e, eye; c, notochord, running through the middle of the basilar plate or parachordal cartilage, in which are already visible the rudimentary ear-parts, cl, the cochlea, hsc, the horizontal semicircular canal; pts, the pituitary space, bounded by tr, the trabeculae, which come together before it to form the fronto-nasal plate, fn, in fig. 65; lg, lingula or bridge connecting trabeculae with parachordal cartilage; 5 notch afterward becoming foramen ovale for passage of parts of the fifth (trifacial) nerve; 9, foramen for hypoglossal nerve; q, separate cartilage forming the future quadrate bone." Elliot Coues, 1884

Skull of a Chick

"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 space; fn, fronto-nasal plate; tr, ends of the trabeculae, free again after their union and bent strongly from the original axis of the trabeculae; n, external nostril; mxp, subocular bar of cartilage, or pterygo-palatine rod, to form pa, palatine, and pg, pterygoid bone, and other parts of the upper jaw, as the maxillary, jugal and quadrato-jugal; q, quadrate cartilage, same as seen in fig 64; mk, meckelian cartilage, to form lower jaw; these parts are in the first post-oral visceral arch; ch, cerato-hyal, and bh, basihyal, of second postoral arch; cbr, cerato-branchial, ebr-branchial, bbr, basi-branchial, of third post-oral arch; the parts of the second and third arch all going into the hyoid bone. 1, 2, 3, 1st, 2d, 3d, visceral clefts, whereof the 1st is to be modified into the ear-passages, and the others are to be obliterated." Elliot Coues, 1884

Skull of a Chick Below

"Skull of a chick, but seen from below. cv1, anterior cerebral vesicle; e, eye; m, mouth; pts, pituitary…