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Mucous membrane of a frog's intestine during fat absorption. Labels: ep, epithelium; str, striated borer; C, lymph corpuscles; l, lacteal.

Mucous Membrane of Frog's Intestine

Mucous membrane of a frog's intestine during fat absorption. Labels: ep, epithelium; str, striated borer;…

Horizontal preparation of cornea of frog; showing the network of branched cornea-corpuscles. The ground substance was completely colorless.

Magnified Frog Cornea Showing Branched Corpuscles

Horizontal preparation of cornea of frog; showing the network of branched cornea-corpuscles. The ground…

Capillary blood vessel of the tail of a young larval frog. a, capillaries permeable to blood; b, fat granules attached to the walls of the vessels, and concealing the nuclei; c, hollow prolongation of a capillary ending in a point; d, a branching cell with nucleus and fat granules; it communicates by three branches with prolongation of capillaries already formed; e, blood corpuscles still containing granules of fat.

Capillary Blood Vessels of Larval Frog

Capillary blood vessel of the tail of a young larval frog. a, capillaries permeable to blood; b, fat…

"The cocoons represent the pupa stage; they are commonly called ant-eggs, and are carefully tended by the workers."

Red Wood Ant Pupae (bottom)

"The cocoons represent the pupa stage; they are commonly called ant-eggs, and are carefully tended by…

"The cocoons represent the pupa stage; they are commonly called ant-eggs, and are carefully tended by the workers."

Red Wood Ant Pupae (side)

"The cocoons represent the pupa stage; they are commonly called ant-eggs, and are carefully tended by…

The larva is the stage right after the eggs are laid. In this stage, the larva is white and legless.

Red Wood Ant Larva

The larva is the stage right after the eggs are laid. In this stage, the larva is white and legless.

The Antheridium is the male organ of plants. Within it are produced the sperms or their equivalents, which fertilize the female cells or eggs.

Section through Antheridium of Liverwort

The Antheridium is the male organ of plants. Within it are produced the sperms or their equivalents,…

"Cuttlefish are probably the most interesting animals of [the cephalopoda] order. They live for five or six years, and lay eggs, which are large and generally found in clusters, and are known to fishermen as sea-grapes."

Sepia Officinalis (Linnaeus)

"Cuttlefish are probably the most interesting animals of [the cephalopoda] order. They live for five…

"The skull in reptiles is flat, and the cerebral cavity is not filled with brains. There are no ribs."

Skeleton of a Frog

"The skull in reptiles is flat, and the cerebral cavity is not filled with brains. There are no ribs."

"At their birth they respire by means of gills, and consequently resemble fishes. As they progress in age, they undergo permanent metamorphoses - they acquire lungs and thenceforth an aerial respiration."

Alphabet Frog (Ceratophrys Boiei)

"At their birth they respire by means of gills, and consequently resemble fishes. As they progress in…

"The body of the Edible Frog sometimes attains a length, from the extremity of the muzzle to the end of the hind feet, of six to eight inches."

The Edible Frog

"The body of the Edible Frog sometimes attains a length, from the extremity of the muzzle to the end…

"When the female has laid her eggs, the male takes them and piles them on her back." Her skin becomes inflamed until the eggs are absorbed into her skin.

Surinam Toad

"When the female has laid her eggs, the male takes them and piles them on her back." Her skin becomes…

"Its size is about twenty inches. They feed almost exclusively on insects, but attack frogs, mice, etc., and destroy the eggs of the partridge."

Ocellated Lizard

"Its size is about twenty inches. They feed almost exclusively on insects, but attack frogs, mice, etc.,…

"The female does not build a nest or cover her eggs; neither does she take care of her young. The eggs are laid in the nests of other birds and the care of hatching the eggs and feeding their young is left to these strangers."

Pheasant Cuckoo

"The female does not build a nest or cover her eggs; neither does she take care of her young. The eggs…

"Cuckoos lay from eight to ten eggs in the space of a few weeks. When an egg has been laid, the female seizes it in her beak and carries it to the first unoccupied nest in the vicinity."

American Cuckoo

"Cuckoos lay from eight to ten eggs in the space of a few weeks. When an egg has been laid, the female…

A: Eggs B: Larva C: Pupa D: Imago, or perfect insect

Hydrophilus in its Four States

A: Eggs B: Larva C: Pupa D: Imago, or perfect insect

"The number of gnats which come into existence in the course of a year is marvelous."

Magnified Eggs of the Gnat

"The number of gnats which come into existence in the course of a year is marvelous."

Because they resemble the humblebee, they introduce their eggs into humblebee nests. When the larvae hatch, they devour the larvae of their hosts.

A Species of Volucella

Because they resemble the humblebee, they introduce their eggs into humblebee nests. When the larvae…

"During the months of July and August, the Estrus frequents pastures, and deposits its eggs on the shoulders, knees, etc., of horses."

Male Horse-Fly, Estrus (Gasterophilus) Equi

"During the months of July and August, the Estrus frequents pastures, and deposits its eggs on the shoulders,…

"During the months of July and August, the Estrus frequents pastures, and deposits its eggs on the shoulders, knees, etc., of horses."

Female Horse-Fly, Estrus (Gasterophilus) Equi

"During the months of July and August, the Estrus frequents pastures, and deposits its eggs on the shoulders,…

"The eggs are white and conical. They adhere to the horse's hair."

Eggs of Gadfly, Estrus (Gasterophilus) Equi

"The eggs are white and conical. They adhere to the horse's hair."

"They derive nourishment from flowers, deposit their eggs on caterpillars, and the young larvae on hatching penetrate their bodies, and feed on them."

Echinomyia Grossa

"They derive nourishment from flowers, deposit their eggs on caterpillars, and the young larvae on hatching…

"Toward the month of May, these disgusting insects lay oblong, whitish eggs."

Egg of Bug

"Toward the month of May, these disgusting insects lay oblong, whitish eggs."

"Female Cicada Laying her Eggs in the Groove She has Bored in the Branch of a Tree. While the female does not sing, she is given an organ which is of more practical value. This is a sort of an auger, destined to penetrate the back of the branches of trees."

Female Cicada Laying her Eggs

"Female Cicada Laying her Eggs in the Groove She has Bored in the Branch of a Tree. While the female…

"From the eggs deposited come small, white grubs, which leave their nest in the wood to bury themselves in the ground."

Larva of the Cicada

"From the eggs deposited come small, white grubs, which leave their nest in the wood to bury themselves…

"The endeavor of each player is to insert his hook through the ribbon loop on one of the eggs and lift it out of the ring, doing this as quickly as possible and catching as many as he can." -Beard, 1906

Angling for Easter eggs

"The endeavor of each player is to insert his hook through the ribbon loop on one of the eggs and lift…

Females will take approximately three days to lay their eggs. When completed, they will have laid between 300 and 700 eggs in total.

Silkworm Moth, Female (Bombyx Mori)

Females will take approximately three days to lay their eggs. When completed, they will have laid between…

1. Leaf with batches of eggs laid upon it. 2. Batches of recently aid eggs. 3. Eggs in which caterpillars can be perceived. 4. Batch of eggs from which the caterpillars have already emerged. 5. Small caterpillars hanging by threads. 6. Leaf with the chrysalis. 7. Caterpillar. 8. Moth.

The Vine Pyralis in its Three States

1. Leaf with batches of eggs laid upon it. 2. Batches of recently aid eggs. 3. Eggs in which caterpillars…

"The caterpillar is often called the vine worm, summer worm, vintage worm, or shell. Almost immediately after they leave the eggs, the little caterpillars hide themselves in the fissures of the vine stocks of the props which support them."

Caterpillar of the Vine Pyralis

"The caterpillar is often called the vine worm, summer worm, vintage worm, or shell. Almost immediately…

They use their foremost legs as shovels to hollow out underground areas to hide and lay eggs. They are detrimental to agriculture.

Mole Cricket (Gryllo Talpa Vulgaris)

They use their foremost legs as shovels to hollow out underground areas to hide and lay eggs. They are…

"The female is smaller than the male, and has a longer body than the working bee; the wings are shorter in proportion. The only part she has to play is that of laying eggs, so she has no palettes and brushes."

Female or Queen Bee (Apis Mellifica)

"The female is smaller than the male, and has a longer body than the working bee; the wings are shorter…

"Portion of the comb, with the eggs occupying the cells. One of the royal cells has been opened by the queen."

Portion of the Comb

"Portion of the comb, with the eggs occupying the cells. One of the royal cells has been opened by the…

"The Carpenter Bee, or Wood Piercer, hollows out galleries in decayed wood, and builds in them cells placed one over the other - a work often occupying many weeks."

Carpenter Bee, Pupae, Eggs, Galleries and Nests

"The Carpenter Bee, or Wood Piercer, hollows out galleries in decayed wood, and builds in them cells…

"It also belongs to the family which manages to place its eggs under the skin of other insects."

Species of Pimpla

"It also belongs to the family which manages to place its eggs under the skin of other insects."

"The <em>Ophions</em> lay their eggs under the skin of caterpillars."

Species of Ophion

"The Ophions lay their eggs under the skin of caterpillars."

"The insects of the genus <em>Sirex</em> belong to a species which lay their eggs in living wood, and their larvae live for amny years in the interior of this wood. The mandibles of the larvae are of great strength, capable of perforating lead."

Saw Fly (Sirex Gigas)

"The insects of the genus Sirex belong to a species which lay their eggs in living wood, and…

"The female attains to six inches in length, and weighs as much as thirty thousand workers. It is an increase in the size of the abdomen alone. She produces sixty eggs a minute, more than eighty thousand a day."

Termes Lucifugus, Female

"The female attains to six inches in length, and weighs as much as thirty thousand workers. It is an…

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.

"Some species collect portions of excrement, which they make up into balls and roll them until they are as perfectly rounded as pills, in which they lay their eggs."

Scarabaeus (Golofa) Porteri

"Some species collect portions of excrement, which they make up into balls and roll them until they…

The angler (Lophius piscatorius) is a monkfish known for catching prey with a lure hanging above its large mouth.

Angler

The angler (Lophius piscatorius) is a monkfish known for catching prey with a lure hanging above its…

"The female is sometimes seen clinging to aquatic plants head downward, forming her cocoon, terminated by a long pedicle, in which she places her eggs, by means of the two bristles situated at the extremity of the abdomen."

Bristles at the Extremity of the Abdomen of the Hydrophilus Piceus

"The female is sometimes seen clinging to aquatic plants head downward, forming her cocoon, terminated…

"The female <em>Sitaris Humeralis</em> lays at the entrance of the nest of a solitary bee from 2,000 to 3,000 small, whitich eggs, stuck together in shapeless masses."

Sitaris Humeralis

"The female Sitaris Humeralis lays at the entrance of the nest of a solitary bee from 2,000…

"A month afterward there come out of these eggs very small larvae, of a shining dark green, hard-skinned, armed with strong jaws, and long legs and antennae. As the bees come out of their nests, these larvae hook themselves onto their hairs."

First Larva of Sitaris Humeralis

"A month afterward there come out of these eggs very small larvae, of a shining dark green, hard-skinned,…

"When the male bees have built the cells and furnished them with honey, the female, as we know, deposits in each an egg. Immediately the larvae of the <em>Sitaris</em> let themselves fall onto these eggs, open them and suck their contents. Then they change their skin, and the second larva appears."

Pseudo Nymph of Sitaris Humeralis

"When the male bees have built the cells and furnished them with honey, the female, as we know, deposits…

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 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.

A nerve fiber from a frog.

Nerve Fiber from Frog

A nerve fiber from a frog.

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.

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.

The hessian fly or barley midge, Mayetiola destructor, is a species of fly that is a significant pest of cereal crops including wheat, barley and rye. Though a native of Asia it was transported into Europe and later into North America, supposedly in the straw bedding of Hessian troops during the American Revolution (1775&ndash;83). There are usually two generations a year but may be up to five. In the spring the dark-coloured female lays about 250 to 300 reddish eggs on plants, usually where the stems are covered by leaves; the larvae feed on the sap and weaken the plants so that they cannot bear grain.

Hessian Fly

The hessian fly or barley midge, Mayetiola destructor, is a species of fly that is a significant pest…

Orgyia leucostigma, the White-marked tussock moth, is a moth in the family Lymantriidae. The caterpillar is very common especially in late summer in eastern North America, as far west as Texas, Colorado, and Alberta. There are two or more generations a year in eastern North America (Wagner 2005). They overwinter in the egg stage. Eggs are laid in a single mass over the cocoon of the female, and covered in a froth (Wagner 2005). Up to 300 eggs are laid at a time. he larvae are brightly coloured, with tufts of hair-like setae. The head is bright red, the body has yellow or white stripes, with a black stripe along the middle of the back. There are bright red defensive glands on the hind end of the back. Four white toothbrush-like tufts stand out from the back, and there is a grey-brown hair pencil at the hind end. Touching the hairs will set off an allergic reaction in many humans (Wagner 2005). Young larvae skeletonize the surface of the leaf, while older larvae eat everything except the larger veins (Rose and Lindquist, 1982). They grow to about 35 mm.

White-marked Tussock Caterpillar

Orgyia leucostigma, the White-marked tussock moth, is a moth in the family Lymantriidae. The caterpillar…

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.

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 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…

The Black-billed Cuckoo, Coccyzus erythropthalmus, is a cuckoo. Adults have a long brown tail and a black bill. The head and upper parts are brown and the underparts are white. There is a red ring around the eye. Juveniles are drabber, and the eye ring is greenish. Their breeding habitat is edges of wooded areas across North America east of the Rockies. They nest in a low tree or shrub, sometimes on the ground. They sometimes lay eggs in the nests of other birds.

Black-billed Cuckoo

The Black-billed Cuckoo, Coccyzus erythropthalmus, is a cuckoo. Adults have a long brown tail and a…

The Bobolink, Dolichonyx oryzivorus, is a small New World blackbird and the only member of genus Dolichonyx. Adults are 16-18 cm long with short finch-like bills. Adult males are mostly black, although they do display creamy napes, and white scapulars, lower backs and rumps. Adult females are mostly light brown, although their coloring includes black streaks on the back and flanks, and dark stripes on the head; their wings and tails are darker. Their breeding habitats are open grassy fields, especially hay fields, across North America. In high-quality habitats, males are often polygynous. Females lays 5 to 6 eggs in a cup-shaped nest, which is always situated on the ground and is usually well-hidden in dense vegetation. Both parents feed the young.

Bobolink (Male)

The Bobolink, Dolichonyx oryzivorus, is a small New World blackbird and the only member of genus Dolichonyx.…

The Bobolink, Dolichonyx oryzivorus, is a small New World blackbird and the only member of genus Dolichonyx. Adults are 16-18 cm long with short finch-like bills. Adult males are mostly black, although they do display creamy napes, and white scapulars, lower backs and rumps. Adult females are mostly light brown, although their coloring includes black streaks on the back and flanks, and dark stripes on the head; their wings and tails are darker. Their breeding habitats are open grassy fields, especially hay fields, across North America. In high-quality habitats, males are often polygynous. Females lays 5 to 6 eggs in a cup-shaped nest, which is always situated on the ground and is usually well-hidden in dense vegetation. Both parents feed the young.

Bobolink (Female)

The Bobolink, Dolichonyx oryzivorus, is a small New World blackbird and the only member of genus Dolichonyx.…

The chigoe flea (Tunga penetrans) is a parasitic arthropod found in tropical climates, especially South America and the West Indies. At 1 mm long, the chigoe flea is the smallest known flea. Breeding female chigoes burrow into exposed skin and lay eggs, causing intense irritation. After this point, the skin lesion looks like a 5 to 10 mm white spot with a central black dot, which are the flea's exposed hind legs, respiratory spiracles and reproductive organs.

Chigoe Flea (Male)

The chigoe flea (Tunga penetrans) is a parasitic arthropod found in tropical climates, especially South…