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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…

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…

"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."—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 foot of a frog, which is useful in and out of water.

Frog Foot

The foot of a frog, which is useful in and out of water.

A diagram showing the motions a young frog makes while swimming. In this stage of life, the frog makes ellipses in order to move through the water.

Ellipses of Swimming Frog

A diagram showing the motions a young frog makes while swimming. In this stage of life, the frog makes…

A diagram showing the motions a young frog makes whilst swimming. In this stage of the frog's life, the frog uses looping motions to move through the water.

Loops of Swimming Frog

A diagram showing the motions a young frog makes whilst swimming. In this stage of the frog's life,…

A diagram demonstrating the motion a frog makes whilst swimming. In this stage of the frog's life, the frog makes waved lines while moving through the water.

Swim Lines of Frog

A diagram demonstrating the motion a frog makes whilst swimming. In this stage of the frog's life, the…

Three eggs.

Three Eggs

Three eggs.

Four eggs.

Four Eggs

Four eggs.

Apples are prone to infestation by the codlin moth during the month of May. The moth lays its eggs in the leaves of the young apple. The caterpillar gnaws its way down the fruit.

Codlin Moth and Grub in an Apple

Apples are prone to infestation by the codlin moth during the month of May. The moth lays its eggs in…

Frog hopper belong to the same order as aphidoe, to the section which has the leathery upper wings. It is the larva of the frog hoppers the produce a frothy secretion referred to as frog spit or cuckoo spit. This secretion is harmful to plants.

Larva, Frothy Secretion, and Perfect Insect of the Frog Hopper

Frog hopper belong to the same order as aphidoe, to the section which has the leathery upper wings.…

Mottled umber moth is the common name of hybernia defoliaria. The moths emerge between October and March. The females crowl on to the food plants to lay their eggs.

Male, Female, and Larva of the Mottled Umber Moth

Mottled umber moth is the common name of hybernia defoliaria. The moths emerge between October and March.…

Ichneumon flies have slender bodies, veined wings with the veins enclosing several spaces or cells, and long vibratile antennae of numerous joints. Ichneumon flies lay their eggs on the bodies of other insects.

Ichneumon Fly

Ichneumon flies have slender bodies, veined wings with the veins enclosing several spaces or cells,…

Ichneumon flies deposit their eggs upon the bodies of other insects and larva. The larva live on the interior of their host.

Ichneumon Fly

Ichneumon flies deposit their eggs upon the bodies of other insects and larva. The larva live on the…

Female winter moths have wings so small that they have little to no use. The females must crawl up the plants on which they lay their eggs.

Male, Female, and Caterpillar of the Winter Moth

Female winter moths have wings so small that they have little to no use. The females must crawl up the…

Frog hoppers belong to the order Heteroptera. This order is also known as plant bugs. These insects are very small.

Larva, Frothy Section, and Perfect Insect of the Frog Hopper

Frog hoppers belong to the order Heteroptera. This order is also known as plant bugs. These insects…

Bombyx Neustria, or the lackey moth, lay their eggs on the twigs of various trees. When the larvae emerge they are black.

Lackey Moth

Bombyx Neustria, or the lackey moth, lay their eggs on the twigs of various trees. When the larvae emerge…

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…

Woolly aphis is a plant lice. Eggs are attached to twigs during the winter. In the spring soft-bodied, wingless female aphid appear and give birth to young aphids. They suck the juices from leaves or twigs.

Wooly Aphis on Alnus

Woolly aphis is a plant lice. Eggs are attached to twigs during the winter. In the spring soft-bodied,…

Illustrated is a man pouring food onto a "food tree" for birds. A food tree imitates a coniferous tree covered with insect eggs and larvae. A mixture of hot liquid food is poured on the tree and it hardens as it cools.

Food Tree

Illustrated is a man pouring food onto a "food tree" for birds. A food tree imitates a coniferous tree…

An image of a right-hand frog, or overhead switch. Switches are used when a wire needs to branch off and merge into another wire.

Right-hand Frog

An image of a right-hand frog, or overhead switch. Switches are used when a wire needs to branch off…

A left-hand frog, or overhead switch. Switches are used when trolley wires branch off with another wire, like at intersections.

Left-hand Frog

A left-hand frog, or overhead switch. Switches are used when trolley wires branch off with another wire,…

Rocky Mountain Locust. A) female in different positions, B) egg sac, C) loose eggs, D) and E) earth removed to show egg-mass already in placed and about to be placed, F) where an egg-mass has been covered up

Rocky Mountain Locust

Rocky Mountain Locust. A) female in different positions, B) egg sac, C) loose eggs, D) and E) earth…

A type of flower.

Frog Bit

A type of flower.

A gadfly, or Bot-fly, that lays its eggs on horses. After these eggs hatch on the skin, the larvae bore into the skin and create tumors ('warbles') beneath it. When fully fed, they leave their host and drop to the ground, bury themselves, and, after pupation, emerge as flies. This illustration is enlarged, and also shows the larvae.

Gadfly of Horse

A gadfly, or Bot-fly, that lays its eggs on horses. After these eggs hatch on the skin, the larvae bore…

The Gadfly of the sheep lays its eggs in the nostrils of the sheep. There, the maggots hatch and live in the frontal sinuses until fully grown, they then drop to the ground and bury themselves. After pupation, they emerge as flies. This illustration is natural size and shows a Gadfly larvae.

Gadfly of Sheep

The Gadfly of the sheep lays its eggs in the nostrils of the sheep. There, the maggots hatch and live…

Galeopithecus is the generic name of certain mammals from the Malayan region, commonly (incorrectly) referred to as flying lemurs. The two species of Galeopithecus are now placed in a sub-order of Insectivora, and regarded as the vegetarian analogues of the insect-eating bats. The common species, G. volans, is about the size of a cat and has a flying-membrane. The teeth are remarkable, the lower incisors being comb-like, while the upper outer incisor at each side has two roots. Galeopithecus primarily inhabit forests. They feed upon leaves, fruit, eggs, insects, and even small birds. They are nocturnal. Though incapable of true flight, they can take long, flying leaps.

Galeopithecus

Galeopithecus is the generic name of certain mammals from the Malayan region, commonly (incorrectly)…

Its color is olive-gray or brown above, with black bands and spots, and checkered black and white beneath. The usual length is three feet. It is nearly related to the American water-snake, and haunts moist places, feeding on frogs, fish, and insects. The soft eggs are about one inch long, and are laid in manure heaps, in rich soil, or on heaps of weeds.

Grass Snake

Its color is olive-gray or brown above, with black bands and spots, and checkered black and white beneath.…

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…

European Kites are very miscellaneous feeders, but depend largely on offal, and in the eastern tropics they are valuable as scavengers. The nest is usually placed in a tree, and consists of a mass of sticks lined with rags and paper; the eggs are three to four in number. The name kite is strictly applicable to the rare European Red Kite.

European Kite

European Kites are very miscellaneous feeders, but depend largely on offal, and in the eastern tropics…

A handsome plover-like bird of Northern Europe and Asia (Vanellus cristatus), also known in Great Britain as peewit, or green plover, the lapwing is greenish above, with a black breast and white abdomen and cheeks, and erectile plumes in the crest. The four eggs (known in British markets as 'plover eggs') are laid in a depression of the ground without any nest; but the watchful care of the parents, and the artifices by which they seek to divert attention from the eggs or young, are so familiar as to be often referred to in poems and homilies. The food consists of worms, insects, and slugs.

Lapwing (or Peewit)

A handsome plover-like bird of Northern Europe and Asia (Vanellus cristatus), also known in Great Britain…

The common skylark is a small bird of the passerine family Alaudidae. In all larks, the first toe has a very long, straight claw; the wings are long and pointed, as are also the inner secondaries of the wing. The skylark (A. arvensis) prefers open districts. It nests on the ground and lays spotted eggs.

Common Skylark

The common skylark is a small bird of the passerine family Alaudidae. In all larks, the first toe has…

The medicinal leech is a leech used in bloodletting. It lives in fresh water, and is common in Germany, Bohemia, and Russia. Its diet consists of the blood of vertebrates, to which the leech attaches itself by its suckers. Of these, one is posterior and imperforate, the other anterior, with the mouth in the center. Within the mouth lie three triangular tooth-plates, by means of which a small triradiate incision is made in the skin of the animal attacked. This done, the leech proceeds to fill its crop, which extends almost from end to end of the body, and has eleven lateral pockets. When these have become distended with blood, the leech drops from its temporary host, and the slow process of digestion begins. Leeches usually move by attaching alternately the anterior and posterior suckers, somewhat after the fashion of a 'looping caterpillar', but they can also swim by movements of the whole body. The eggs are laid in cocoons in damp earth.

Medicinal Leech

The medicinal leech is a leech used in bloodletting. It lives in fresh water, and is common in Germany,…

This illustration shows a human leg (front view), and comparative diagrams showing modifications of the leg: 1. Human, 2. Ox, 3. Horse, 4. Bird, 5. Frog, 6. Crocodile, 7. Seal, 8. Dog, 9. Bear P. Pelvis, FE. Femur, TI. Tibia, FI. Fibula, TA. Tarsus, MT. Metatarsus, PH. Phalanges, OC. Os Calcis.

Human Leg (Front View), and Comparative Diagrams showing Modifications of the Leg

This illustration shows a human leg (front view), and comparative diagrams showing modifications of…

This illustration shows the leg of a frog. P. Pelvis, FE. Femur, TI. Tibia, FI. Fibula, TA. Tarsus, MT. Metatarsus, PH. Phalanges, OC. Os Calcis.

Leg of Frog

This illustration shows the leg of a frog. P. Pelvis, FE. Femur, TI. Tibia, FI. Fibula, TA. Tarsus,…

<i>Scaphiopus holbrooki</i>. Illustration of the American spadefoot toad, native to Canada, the United States, and Mexico. It is a roundish toad with large, protruding eyes.

Spadefoot Toad

Scaphiopus holbrooki. Illustration of the American spadefoot toad, native to Canada, the United States,…