The book A Student's Text-Book of Zoology was written by author Shipley, A. E. (Arthur Everett), Sir, 1861-1927 Here you can read free online of A Student's Text-Book of Zoology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Student's Text-Book of Zoology a good or bad book?
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The Cetacea usually live together in herds (schools). The smaller species frequent the coasts and some of them ascend rivers ; others are mainly fluviatile. The larger species prefer the open sea. They swim with great strength and speed, usually keeping near the surface,to which they have frequently to ascend for respiration. They can stay under the surface for a long time. Some of the larger whales can remain submerged for more than an hour, certainly for two hours and possibly for more. The s...pout- ing or blowing of whales is not a spout of water ejected from the nostrils, but is due to the condensation in the cold atmo- sphere of the aqueous vapour of the column of warm and com- pressed expired air, which issu^ with great force when the animal reaches the surface. The Cetacea are carnivorous predaceous animals. Most of them feed on small marine organisms and on fish and cephalopods. The gigantic whalebone whales, which are without teeth, but possess whalebone on the palate, feed on small floating marine animals, nudibranchiate molluscs and jelly fish, etc.
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