ClipArt ETC
A snake chasing a frog.

Snake and frog

A snake chasing a frog.

"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,…

"The Tadpole is the larva of the anurous amphibia, sometimes so far extended as to include larvaæ of the urodela, which undergo a much less complete metamorphosis. At first the young have no respiratory organs or limbs. They are all head and tail with simple entire gills which soon disappear, to be followed by others of more complicated structure, situated within the cavity of the body as in fishes. After a certain length of time the hind legs begin to appear, the head becomes more developed, and the body assumes a more compact form. Still later the forelegs are found to exist fully formed beneath the skin and ready ultimately to burst forth. The tadpole at first seems to derive its subsistence from the fluid absorbed within its body and on the surface, but soon begins to seek its food amidst softened or decomposing vegetable matter. From that period the tadpole begins to assume more and more the appearance of a frog. Toes appear on its hind legs, the tail very rapidly disappears by absorption, and finally the fore-legs become fully developed and the metamorphosis of the tadpole is completed."—(Charles Leonard-Stuart, 1911)

Tadpole

"The Tadpole is the larva of the anurous amphibia, sometimes so far extended as to include larvaæ…

"The Tadpole is the larva of the anurous amphibia, sometimes so far extended as to include larvaæ of the urodela, which undergo a much less complete metamorphosis. At first the young have no respiratory organs or limbs. They are all head and tail with simple entire gills which soon disappear, to be followed by others of more complicated structure, situated within the cavity of the body as in fishes. After a certain length of time the hind legs begin to appear, the head becomes more developed, and the body assumes a more compact form. Still later the forelegs are found to exist fully formed beneath the skin and ready ultimately to burst forth. The tadpole at first seems to derive its subsistence from the fluid absorbed within its body and on the surface, but soon begins to seek its food amidst softened or decomposing vegetable matter. From that period the tadpole begins to assume more and more the appearance of a frog. Toes appear on its hind legs, the tail very rapidly disappears by absorption, and finally the fore-legs become fully developed and the metamorphosis of the tadpole is completed."—(Charles Leonard-Stuart, 1911)

Tadpole

"The Tadpole is the larva of the anurous amphibia, sometimes so far extended as to include larvaæ…

A developing tadpole.

A developing tadpole

A developing tadpole.

A developing tadpole.

Developing tadpole

A developing tadpole.

A developing tadpole.

Developing tadpole

A developing tadpole.

A tadpole developing, with small rear legs beginning to form.

Developing tadpole

A tadpole developing, with small rear legs beginning to form.

A close up view of the head of a developing embryonic tadpole.

A developing tadpole's head

A close up view of the head of a developing embryonic tadpole.

The illustration is showing both inside and outside view of the tadpole. The left inside view shows the tadpole with two front legs, heart, intestines, and gills. The right image shows the tadpole with frog like features with forelegs, back legs, and a tail.

Inside and Outside View of Tadpole During Metamorphosis

The illustration is showing both inside and outside view of the tadpole. The left inside view shows…

"Figure 5 shows the form of the tadpole when first hatched, which usually takes place about four weeks after depositing the egg." — Goodrich. 1859

Newly hatched tadpole

"Figure 5 shows the form of the tadpole when first hatched, which usually takes place about four weeks…

The development of a toad, image 1.

Toad

The development of a toad, image 1.

The development of a toad, image 3.

Toad

The development of a toad, image 3.

The development of a toad, image 4.

Toad

The development of a toad, image 4.

The development of a toad, image 5.

Toad

The development of a toad, image 5.

<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,…

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…

"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…