"The Colorado Beetle is a beetle first described by Thomas Say, in 1824, from specimens found by him near the Upper Missouri. The larva feeds greedily on the potato, and having attracted notice in Colorado for its ravages among the crops of that esculent in the territory, it moved eastward year by year, till in 1874 it had reached the Atlantic seaboard. It is popularly known as the potato bug."—(Charles Leonard-Stuart, 1911)

Colorado Beetle Eggs

"The Colorado Beetle is a beetle first described by Thomas Say, in 1824, from specimens found by him…

An illustration of a bird perched on the side of a nest with eggs.

Bird and nest

An illustration of a bird perched on the side of a nest with eggs.

This is a nest made by birds with eggs inside the nest.

Bird Nest with Eggs

This is a nest made by birds with eggs inside the nest.

An illustration of tent caterpillar eggs. Tent caterpillars are moderately sized species in the genus Malacosoma in the moth family Lasiocampidae. Species occur in North America, Mexico, and Eurasia. Twenty-six species have been described, six of which occur in North America. Some species are considered to have subspecies as well. Although most people consider tent caterpillars only as pests due to their habit of defoliating trees, they are among the most social of all caterpillars and exhibit many noteworthy behaviors.

Tent Caterpillar Eggs

An illustration of tent caterpillar eggs. Tent caterpillars are moderately sized species in the genus…

An illustration of a catfish with eggs attached to the underside.

Catfish with Eggs Attached

An illustration of a catfish with eggs attached to the underside.

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.

An illustration of a hen with her eggs.

Chicken and Eggs

An illustration of a hen with her eggs.

A chick and eggs

Chick

A chick and eggs

The Minorcas are similar to the Leghorns, with their main value being egg-producing. The produce less eggs than the Leghorns, but their eggs are generally larger, and equal the output in bulk.

Black Minorca Cockerel

The Minorcas are similar to the Leghorns, with their main value being egg-producing. The produce less…

The Common Guillemot (<i>Uria troile</i>) is a member of the auk family. It breeds on all rocky coasts of the North Atlantic. The bill is long, straight, and strong, the wings and tail short. In spring, the upper surface of the body is brownish black, the under white, save for the dark throat; in winter, the throat becomes white or mottled. All guillemots lay a single pear-shaped on the ledge of a sea-cliff. They make no nest whatever, and large colonies brood in company.

Common Guillemot

The Common Guillemot (Uria troile) is a member of the auk family. It breeds on all rocky coasts of the…

A chicken coop

Coop

A chicken coop

A chicken coop

Coop

A chicken coop

An illustration of a crap carrying a mass of eggs beneath its abdomen.

Crab

An illustration of a crap carrying a mass of eggs beneath its abdomen.

An illustration of a male cricket with eggs.

Male Cricket with Eggs

An illustration of a male cricket with eggs.

A body formed in the females of birds, and some other animals, from which their young is produced.

Egg

A body formed in the females of birds, and some other animals, from which their young is produced.

"Fig. 6- scissors, knives, and forceps, 1/2 natural size." Elliot Coues, 1994 These items may be used to seize and draw out a membrane or embryo from the egg.

Scissors, Knives, and Forceps Used for Egg Blowing

"Fig. 6- scissors, knives, and forceps, 1/2 natural size." Elliot Coues, 1994 These items may be used…

"Figure 7-hooks for extracting embryos, natural size; a,b,c, plain hooks; d, bill-hook, having cutting edge along the concavity." Elliot Coues, 1884

Hooks Used in the Process of Egg Blowing for the Purpose of Extracting Embryos

"Figure 7-hooks for extracting embryos, natural size; a,b,c, plain hooks; d, bill-hook, having cutting…

"Figure 5-Instruments for blowing eggs; a,b, blow-pipes, 1/2 natural size; c, wire for cleansing them; d, syringe, 1/2 natural size (the ring of the handle must be large enough to insert the thumb); e, bulbous insufflator, for sucking eggs." Elliot Coues, 1884

Several Special Instruments Used in the Process of Egg Blowing

"Figure 5-Instruments for blowing eggs; a,b, blow-pipes, 1/2 natural size; c, wire for cleansing them;…

"Figure 4 - egg-drills, different sizes. Steel implements with a sharp-pointed conical head of rasping surface, and a slender shaft; several such, of different sizes, are needed" Elliot Coues, 1884

Egg Drills are Special Tools Used for Preparing and Blowing Eggs

"Figure 4 - egg-drills, different sizes. Steel implements with a sharp-pointed conical head of rasping…

Egg masses of Stagmomantis Carolina.

Eggs

Egg masses of Stagmomantis Carolina.

Caterpillar eggs on a branch.

Caterpillar Eggs

Caterpillar eggs on a branch.

A fish in a hatchery

Fish

A fish in a hatchery

Girl finds a nest.

Girl finds a nest

Girl finds a nest.

Hamburgs are considered to be excellent egg producers. They are small in size and are capable of flight.

Pair of Silver-Spangled Hamburgs

Hamburgs are considered to be excellent egg producers. They are small in size and are capable of flight.

" Fig 110 - Hens egg, nat. size, in section; from Owen, after A. Thompson. A, cicatricle or "tread," with its nucleus, of white germ-yelk, floating on surface of pale thin nutritive yelk, leading to central yelk-cavity, x; a, the yellow yelk-ball, deposited in the successive layers, forming a set of halones, and enveloped in the chalaziferous membrane which is spun out at opposite poles into the twisted strings, chalazae, c, c; b, b', successive investments of softer white albumen; d, membrana putaminis, the "soft shell" or egg-pod, between layers of which at the great end of the egg is the air space, f;e, the shell." Elliot Coues, 1884

Hen's Egg

" Fig 110 - Hens egg, nat. size, in section; from Owen, after A. Thompson. A, cicatricle or "tread,"…

Andalusians are generally classified as "Mediterranean" chickens. They are relatively rare, and can produce up to 160 eggs per year.

Blue Andalusian Hen

Andalusians are generally classified as "Mediterranean" chickens. They are relatively rare, and can…

The Southern Katydid, Microcentrum laurifolium- 1, the female adult; 1a, eggs laid on leaves and twigs of orange; 1b, the young katydids; 2b, parasites on the eggs.

Katydid

The Southern Katydid, Microcentrum laurifolium- 1, the female adult; 1a, eggs laid on leaves and twigs…

The larvae of the lily beetle live on lilies, devouring their leaves. The antennae are on the front of the head of the beetle.

Eggs, Larvae, and Perfect Insect of the Lily Beetle

The larvae of the lily beetle live on lilies, devouring their leaves. The antennae are on the front…

An illustration of cankerworm moth eggs laid on an apple tree twig. Cankerworm moth eggs are typically fed on by Chicadees.

Eggs of Cankerworm Moth

An illustration of cankerworm moth eggs laid on an apple tree twig. Cankerworm moth eggs are typically…

An illustration of an egg cluster of the Gipsy Moth.

Egg Cluster of Gipsy Moth

An illustration of an egg cluster of the Gipsy Moth.

The horneo oven-bird, which builds its nest out of clay, straw, and dried vegetation.

Hornero Ovenbird

The horneo oven-bird, which builds its nest out of clay, straw, and dried vegetation.

An illustration of an owl guarding her eggs from a wolf.

Owl and Wolf

An illustration of an owl guarding her eggs from a wolf.

A tool used in washing the dust off plants. It can also wash the eggs of insects off the leaves before they have a chance to hatch.

Fountain Pump

A tool used in washing the dust off plants. It can also wash the eggs of insects off the leaves before…

Oyster-shell scale, Mytilaspis Pomorum species; a female scale, from beneath, feilled with eggs.

Oyster-shell Scale

Oyster-shell scale, Mytilaspis Pomorum species; a female scale, from beneath, feilled with eggs.

Oyster-shell scale, Mytilaspis Pomorum species; a female scale, from above, filled with eggs.

Oyster-shell Scale

Oyster-shell scale, Mytilaspis Pomorum species; a female scale, from above, filled with eggs.

Oyster-shell scale, Mytilaspis Pomorum species; a twig infested by female scales.

Oyster-shell Scale

Oyster-shell scale, Mytilaspis Pomorum species; a twig infested by female scales.

Oyster-shell scale, Mytilaspis Pomorum species; a male scale and a twig infested therewith.

Oyster-shell Scale

Oyster-shell scale, Mytilaspis Pomorum species; a male scale and a twig infested therewith.

An illustration of the lower portion of a sponge.  O, OS, and M are illustrations of sponge eggs magnified forty times.  The sponges or poriferans (from Latin porus "pore" and ferre "to bear") are animals of the phylum Porifera. Their bodies consist of an outer thin layer of cells, the pinacoderm and an inner mass of cells and skeletal elements, the choanoderm. Sponges do not have nervous, digestive or circulatory systems. Instead most rely on maintaining a constant water flow through their bodies to obtain food and oxygen and to remove wastes, and the shapes of their bodies are adapted to maximize the efficiency of the water flow.

Lower Section of Sponge

An illustration of the lower portion of a sponge. O, OS, and M are illustrations of sponge eggs magnified…

Nest of the common European swallow, which can be found in old wells and mines, under the roofs of barns and sheds, in belfries, and sometimes in the fork of a dead tree.

Nest of the Common European Swallow

Nest of the common European swallow, which can be found in old wells and mines, under the roofs of barns…

"The Buffalo Tree-Hopper and its work: a, Adult; b, Fresh egg slits; c, Eggs in slits, natural size; d, Eggs enlarged; e, Scars produced by egg slits."&mdash;The Federal Digest, 1921

Buffalo Tree-Hopper

"The Buffalo Tree-Hopper and its work: a, Adult; b, Fresh egg slits; c, Eggs in slits, natural size;…

"The first change in the parent-cell is that by which it becomes broken up into a mass of cells, each of which is just like itself. This process is called segmentation of the vitellus; each one of the numerous resulting cells is called a cleavage-cell. The nucleus of the parent-cell divides into two; each attracts its half of the yelk; the halves furrow apart and there are now two cleavage cells in place of the one parent-cell a furrow at right angles to the first, and redivision of the nuclei; results in four cleavage-cells. Radiating furrows intermediate to the first two bisect the four cells, and would render eight cells, were not these simultaneously doubled by a circular furrow which cleaves each, with the result of sixteen cleavage-cells. So the subdivision goes on until the parent-cell becomes a mass of cells. This particular kind of cleavage, by radiating and concentric furrowing, is called discoidal, and the resulting heap of little cells assumes the figure of a thin, flat, circular disc. Segmentation of the vitellus, in whatever manner it may go on, results in a mulberry-like mass of cleavage-cells; and the original cytula has become what is called a morula. This process is shown closely here." Elliot Coues, 1884

The Segmentation of the Vitellus

"The first change in the parent-cell is that by which it becomes broken up into a mass of cells, each…

"Root-weevil (Leptops hopei). a, weevil; b, pupa; c, larva, in situ; d, weevil ovipositing on leaf above; e, eggs on opened leaf." -Whitney, 1911

Apple Root Weevil

"Root-weevil (Leptops hopei). a, weevil; b, pupa; c, larva, in situ; d, weevil ovipositing on leaf above;…