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A frog pond in the winter

Frog Pond

A frog pond in the winter

A chick and eggs

Chick

A chick and eggs

Frog-Town, from a nursery rhyme

Frog-Town

Frog-Town, from a nursery rhyme

Ducklings looking at a frog

Ducklings

Ducklings looking at a frog

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.

Caterpillar eggs on a branch.

Caterpillar Eggs

Caterpillar eggs on a branch.

"The fig insect will not lay eggs in the Smyrna fig, but only in the wild fig; therefore one individual may carry the pollen to a dozen Smyrna figs before finding a wild fig whose character it does not recognize before entering the receptacle." — Davison, 1906

Fig Insect

"The fig insect will not lay eggs in the Smyrna fig, but only in the wild fig; therefore one individual…

"The pea weevil is often found in peas in its larval state during summer and autumn, as a pupa in winter, and in the adult form in late spring, when it comes forth to lay its eggs on the pods of the growing peas. Larva." — Davison, 1906

Pea Weevil

"The pea weevil is often found in peas in its larval state during summer and autumn, as a pupa in winter,…

A locust laying eggs.

Locust laying eggs

A locust laying eggs.

Frequenttly deposites its eggs in the nests of other birds, leaving them to hatch by their foster parents.

Cowbird

Frequenttly deposites its eggs in the nests of other birds, leaving them to hatch by their foster parents.

A frog on a lilly pad.

Frog

A frog on a lilly pad.

The heart and lungs of a frog. 1: Heart. 2: Arch of the aorta. 3: Pulmonary artery. 4: Pulmonary veins. 5: Aorta. 6: Vena cava.

Frog

The heart and lungs of a frog. 1: Heart. 2: Arch of the aorta. 3: Pulmonary artery. 4: Pulmonary veins.…

A class of beautiful birds of the pheasant family, native to southeastern Asia. In the wild state peacocks are met with mostly while perching in trees, but they make their nests on the ground, where the peahen lays from twenty to thirty eggs in the early spring and may later be seen in company with a large brood of young, usually from ten to twenty.

Peacock

A class of beautiful birds of the pheasant family, native to southeastern Asia. In the wild state peacocks…

Eggs laid by frogs in water.

Frog Spawn

Eggs laid by frogs in water.

The platypus is a small, half-aquatic mammal endemic to the eastern part of Australia, and one of the five extant species of monotremes, the only mammals that lay eggs instead of giving birth to live young.

Platypus Skull

The platypus is a small, half-aquatic mammal endemic to the eastern part of Australia, and one of the…

An amphibian with a toothed upper jaw and subcylindric or little dilated sacral diapopyses.

Cystignathidae

An amphibian with a toothed upper jaw and subcylindric or little dilated sacral diapopyses.

This illustration shows a tree that has been damaged by a sprice-destroying beetle. a, primary gallery; b, borings packed in side; e, entrance and central burrow through the packed borings; d, larval mines-note how the eggs are grouped on the sides.

Beetle Damage

This illustration shows a tree that has been damaged by a sprice-destroying beetle. a, primary gallery;…

A frog laying on a thick branch.

Frog

A frog laying on a thick branch.

A popular name for wasps that burrow in the ground, in which th lay their eggs, provisioning each cell with the bodies of other insects, on which the larvae feed after hatching.

Digger Wasp

A popular name for wasps that burrow in the ground, in which th lay their eggs, provisioning each cell…

A small frog in from grass.

Frog

A small frog in from grass.

Two mice rowing away from a group of skinny-dipping frogs.

Skinny-dipping Frogs

Two mice rowing away from a group of skinny-dipping frogs.

A mother frog bringing her baby frog to see the crawfish doctor.

Crawfish Doctor

A mother frog bringing her baby frog to see the crawfish doctor.

A frog telling the smaller animals a story, while a porcupine eyes some fruit.

Frog Storyteller

A frog telling the smaller animals a story, while a porcupine eyes some fruit.

"Types of spermatozoa. A, from the round worm (Ascaris) with a cap, somewhat amaeboid; B, from the Crayfish, with numerous projections; C, from Frog; D, from Sea-urchin. h, head; m, middle piece; n, nucleus; t, tailor flagelium." — Galloway

Spermatozoa

"Types of spermatozoa. A, from the round worm (Ascaris) with a cap, somewhat amaeboid; B, from the Crayfish,…

"Section through ovary of a young Mammal. The eggs (o) are seen to be formed from the epithelium. c, connective tissue of ovary; e, epithelium; f, follicle of epithelial cells in which the ova ripen; o, ova in different stages of ripeness." — Galloway

Ovary

"Section through ovary of a young Mammal. The eggs (o) are seen to be formed from the epithelium. c,…

A tree frog perched on many branches.

Tree Frog

A tree frog perched on many branches.

A moth which lays its eggs on young cucumbers and other cucurbitaceous plants.

Pickle Worm Moth

A moth which lays its eggs on young cucumbers and other cucurbitaceous plants.

Its color is brownish olive, above and whitish below. It is sometimes 7 inches long, and has a peculiarly hideous aspect. After the female has laid the eggs the male places them upon her back, fecundates them, and then presses them into cellules, which at that period open from their receptioin, and afterwards close over them.

Surinam Toad

Its color is brownish olive, above and whitish below. It is sometimes 7 inches long, and has a peculiarly…

"Nocturnal moths, with the organs of the mouth in many cases so atrophied as to be unfit for use. These live but a few days, during which the male sees the female and the latter deposits her eggs." — Encyclopedia Britanica; 1893

Bombycina

"Nocturnal moths, with the organs of the mouth in many cases so atrophied as to be unfit for use. These…

"Nocturnal moths, with the organs of the mouth in many cases so atrophied as to be unfit for use. These live but a few days, during which the male sees the female and the latter deposits her eggs." — Encyclopedia Britanica; 1893

Bombycina

"Nocturnal moths, with the organs of the mouth in many cases so atrophied as to be unfit for use. These…

"Nocturnal moths, with the organs of the mouth in many cases so atrophied as to be unfit for use. These live but a few days, during which the male sees the female and the latter deposits her eggs." — Encyclopedia Britanica; 1893

Bombycina

"Nocturnal moths, with the organs of the mouth in many cases so atrophied as to be unfit for use. These…

"Nocturnal moths, with the organs of the mouth in many cases so atrophied as to be unfit for use. These live but a few days, during which the male sees the female and the latter deposits her eggs." — Encyclopedia Britanica; 1893

Bombycina

"Nocturnal moths, with the organs of the mouth in many cases so atrophied as to be unfit for use. These…

"The Pyralidina are a group of small moths readily distinguished by their long slender bodies and large forewings. One of these, Pyralis vitis, is very destructive to vines, and another, Pyralis farinalis, feeds upon meal and flour. The Galleridae, a family of Pyralidine moths, deposit their eggs in the hives of bees, where the caterpillars, enclosed in silken cases, devour the wax; but the Hydrocampidae, which also belong to this section, are probably the most wonderful of all Lepidopterous insects, their larva being aquatic, living and feeding in the water, and many of them beathing by gills similar to those of caddisworms." — Encyclopedia Britanica; 1893

Pyralidina

"The Pyralidina are a group of small moths readily distinguished by their long slender bodies and large…

"The Pyralidina are a group of small moths readily distinguished by their long slender bodies and large forewings. One of these, Pyralis vitis, is very destructive to vines, and another, Pyralis farinalis, feeds upon meal and flour. The Galleridae, a family of Pyralidine moths, deposit their eggs in the hives of bees, where the caterpillars, enclosed in silken cases, devour the wax; but the Hydrocampidae, which also belong to this section, are probably the most wonderful of all Lepidopterous insects, their larva being aquatic, living and feeding in the water, and many of them beathing by gills similar to those of caddisworms." — Encyclopedia Britanica; 1893

Pyralidina

"The Pyralidina are a group of small moths readily distinguished by their long slender bodies and large…

"The Pyralidina are a group of small moths readily distinguished by their long slender bodies and large forewings. One of these, Pyralis vitis, is very destructive to vines, and another, Pyralis farinalis, feeds upon meal and flour. The Galleridae, a family of Pyralidine moths, deposit their eggs in the hives of bees, where the caterpillars, enclosed in silken cases, devour the wax; but the Hydrocampidae, which also belong to this section, are probably the most wonderful of all Lepidopterous insects, their larva being aquatic, living and feeding in the water, and many of them beathing by gills similar to those of caddisworms." — Encyclopedia Britanica; 1893

Pyralidina

"The Pyralidina are a group of small moths readily distinguished by their long slender bodies and large…

"The Pyralidina are a group of small moths readily distinguished by their long slender bodies and large forewings. One of these, Pyralis vitis, is very destructive to vines, and another, Pyralis farinalis, feeds upon meal and flour. The Galleridae, a family of Pyralidine moths, deposit their eggs in the hives of bees, where the caterpillars, enclosed in silken cases, devour the wax; but the Hydrocampidae, which also belong to this section, are probably the most wonderful of all Lepidopterous insects, their larva being aquatic, living and feeding in the water, and many of them beathing by gills similar to those of caddisworms." — Encyclopedia Britanica; 1893

Pyralidina

"The Pyralidina are a group of small moths readily distinguished by their long slender bodies and large…

"The Pyralidina are a group of small moths readily distinguished by their long slender bodies and large forewings. One of these, Pyralis vitis, is very destructive to vines, and another, Pyralis farinalis, feeds upon meal and flour. The Galleridae, a family of Pyralidine moths, deposit their eggs in the hives of bees, where the caterpillars, enclosed in silken cases, devour the wax; but the Hydrocampidae, which also belong to this section, are probably the most wonderful of all Lepidopterous insects, their larva being aquatic, living and feeding in the water, and many of them beathing by gills similar to those of caddisworms." — Encyclopedia Britanica; 1893

Pyralidina

"The Pyralidina are a group of small moths readily distinguished by their long slender bodies and large…

A larva frog.

Tadpole

A larva frog.

A large crab.

Frog Crab

A large crab.

"Crane-fly (Tipula oleracea): a, eggs; b, larva; c, pupa case as left by the insect, sticking out of the eath; d, perfect insect." — Chambers' Encyclopedia, 1875

Crane Fly

"Crane-fly (Tipula oleracea): a, eggs; b, larva; c, pupa case as left by the insect, sticking out of…

"House Cricket (Gryllus domesticus): a, eggs; b, young just hatched; c, full-grown larva; d, pupa; e, perfect insect." — Chambers' Encyclopedia, 1875

House Cricket

"House Cricket (Gryllus domesticus): a, eggs; b, young just hatched; c, full-grown larva; d, pupa; e,…

"Liphistius desultor. Under side of the uplifted genital or first opisthosomatic somite of the female; g, genital aperture; p, pitted plate, probably a gland for the secretion of adhesive material for the eggs; l, the edges of the lamellae of the lung-books of the first pair." — The Encyclopedia Britannica, 1910

Liphistius Desultor

"Liphistius desultor. Under side of the uplifted genital or first opisthosomatic somite of the female;…

"Galvani found that whenever the nerves of a frog's leg were touched by one metal and the muscles by another, convulsions took place on bringing the two different metals in contact." —Wells, 1857

Frog Experiment

"Galvani found that whenever the nerves of a frog's leg were touched by one metal and the muscles by…

A migratory fish. Returns to its birth place to lay and hatch eggs.

Salmon Trout

A migratory fish. Returns to its birth place to lay and hatch eggs.

A migratory fish. Returns to its birth place to lay and hatch eggs.

Atlantic Salmon

A migratory fish. Returns to its birth place to lay and hatch eggs.

A migratory fish. Returns to its birth place to lay and hatch eggs.

California Salmon

A migratory fish. Returns to its birth place to lay and hatch eggs.

"Eggs of mosquitoes. A, Culex; B, Anopheles photographed on the water, natural size." —Davison, 1906

Mosquito Eggs

"Eggs of mosquitoes. A, Culex; B, Anopheles photographed on the water, natural size." —Davison,…

"Pea weevil; adult. The pea weevil (Bruchus) is often found in peas in its larval state during summer and autumn, as a pupa in winter, and in the adult form in late spring, when it comes forth to lay its eggs on the pods of the growing peas. To find the weevil in the fall, soak peas in water for a day." —Davison, 1906

Pea Weevil

"Pea weevil; adult. The pea weevil (Bruchus) is often found in peas in its larval state during summer…

"Pea weevil; pupa. The pea weevil (Bruchus) is often found in peas in its larval state during summer and autumn, as a pupa in winter, and in the adult form in late spring, when it comes forth to lay its eggs on the pods of the growing peas. To find the weevil in the fall, soak peas in water for a day." —Davison, 1906

Pea Weevil

"Pea weevil; pupa. The pea weevil (Bruchus) is often found in peas in its larval state during summer…

"The strawberry weevil in certain seasons has prevented the development of more than a half crop of berries in New Jersey, Delaware, Maryland, the Carolinas, and Virginia. The eggs are deposited in the flower buds, upon which the grublike larva feed and attain full size in about a month." —Davison, 1906

Strawberry Weevil

"The strawberry weevil in certain seasons has prevented the development of more than a half crop of…

"Frog with the left side cut away and some of the organs pulled downward. a, aorta leading from the ventricle; b, bladder; c, spinal cord surrounded by the vertebral column of bone; d, small intestine; e, opening of the lungs into the pharynx; h, ventricle of the heart; k, kidney; l, lung; liv, liver; n, brain; ov, ovary; ovd, oviduct; p, pancreas; r, rectum; sp, spleen; st, stomach; t, tongue; si, small intestine; u, left auricle; ur, ureter; v, vena cava; vc, body of vertebra." —Davison, 1906

Dissected Frog

"Frog with the left side cut away and some of the organs pulled downward. a, aorta leading from the…

Ovarian tubes of one side, in <em>Polistes</em>, showing eggs in all stages of development, with nutritive cells, <em>nm</em>, between; <em>rs</em>, seminal receptacle; <em>ov</em>, oviduct; <em>vag</em>, vagina

Sexual Organ of Insects

Ovarian tubes of one side, in Polistes, showing eggs in all stages of development, with nutritive…

Female hop-louse, showing eggs through skin.

Hop Louse

Female hop-louse, showing eggs through skin.

The larva of a spittle insect

Spittlebug

The larva of a spittle insect

The adult Spittle Insect

Spittlebug

The adult Spittle Insect

<em>Sarcopsylla penetrans</em>-Female distended with eggs

Jigger flea

Sarcopsylla penetrans-Female distended with eggs

A fish in a hatchery

Fish

A fish in a hatchery

A frog and tadpoles

Frog

A frog and tadpoles

A chicken coop

Coop

A chicken coop

A chicken coop

Coop

A chicken coop