. A manual of elementary zoology . Zoology. FROG: EXTERNAL FEATURES AND BODY-WALL 23 mass of spawn and fertilised by the sperm which the male sheds over them as they pass out of the female. In about a fortnight there hatches from each egg a little, fish-like tadpole. This has no limbs, but a strong tail, which it uses for swimming, breathes wholly by gills, and is at first with- out a mouth. In a few days a mouth appears and the animal begins to feed on vegetable matter. Gradually it changes, losing its gills and tail and gaining lungs and two. Fig. 7.—The Common Frog. pairs of limbs, till at
. A manual of elementary zoology . Zoology. FROG: EXTERNAL FEATURES AND BODY-WALL 23 mass of spawn and fertilised by the sperm which the male sheds over them as they pass out of the female. In about a fortnight there hatches from each egg a little, fish-like tadpole. This has no limbs, but a strong tail, which it uses for swimming, breathes wholly by gills, and is at first with- out a mouth. In a few days a mouth appears and the animal begins to feed on vegetable matter. Gradually it changes, losing its gills and tail and gaining lungs and two. Fig. 7.—The Common Frog. pairs of limbs, till at the end of three months it becomes a small frog. Henceforward it lives principally on land, sometimes crawling about by means of both pairs of limbs, but generally jumping with the strong hinder pair and using the small fore pair to break its fall when it alights. When it is frightened, however, it occasionally takes to the water, and then swims strongly with its hind limbs. Its food, after it has left the water, consists of slugs, snails, insects, worms, and other small animals, the smaller prey being caught by a sticky tongue, the larger seized with the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Borradaile, L. A. (Lancelot Alexander), 1872-1945. London : H. Frowde, Hodder & Stoughton
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
