. Beginners' Zoology . Fig. 377. — Molar ToothAfrican Elephant. 208 BEGINNERS ZOOLOGY Whales, Porpoises, Dolphins. — As the absurd mistake,is sometimes made of confusing whales with fish, the pupilmay compare them in the following respects : eggs, nour-ishment of young, fins, skin, eyes, size, breathing, tem-perature, skeleton (Figs. 209, 379, and 397).. Fig. 378. — Harpooning Greenland Whale(see Fig. 351). Po7poises and dolphins, which are smaller species ofwhales, live near the shore and eat fish. Explain the ex-pression blow like a porpoise. They do not exceed fiveor eight feet in length, w
. Beginners' Zoology . Fig. 377. — Molar ToothAfrican Elephant. 208 BEGINNERS ZOOLOGY Whales, Porpoises, Dolphins. — As the absurd mistake,is sometimes made of confusing whales with fish, the pupilmay compare them in the following respects : eggs, nour-ishment of young, fins, skin, eyes, size, breathing, tem-perature, skeleton (Figs. 209, 379, and 397).. Fig. 378. — Harpooning Greenland Whale(see Fig. 351). Po7poises and dolphins, which are smaller species ofwhales, live near the shore and eat fish. Explain the ex-pression blow like a porpoise. They do not exceed fiveor eight feet in length, while the deep-sea whales are fromthirty to seventy-five feet in length, being by far the largestanimals in the world. Tiie size of the elephant is limitedby the weight that the bones and muscles support andmove. The whales size is not so limited. The whale bears one young (rarely twins) at a mother carefully attends the young for a long blubber, or thick layer of fat beneath the skin, servesto retain heat and to keep the body up to the usual tempera-ture of mammals in spite of the cold water. It also serves,along with the immense lungs, to give lightness to the body. MAMMALS 209
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