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It will even defend itself Post Date: Fri, 15 Aug 2008 23:09:50 +0000 Their hard shells it crushes with its broad-crowned molars (compare with the duckbill). The walrus frequently attacks man, even when not provoked, and great caution is necessary lest this ocean giant, with' one blow of his powerful tusks, shatter the side of a boat. It will even defend itself on land, unlike most other members of this family, which generally allow themselves to be driven far inland to the killing-places, where they are despatched with ease by a blow on the nose with a club. Autor of the post: Undefined The dentition consists of all Post Date: Fri, 15 Aug 2008 22:51:06 +0000 Formerly the walrus was killed only for the sake of its tusks, which furnish a good kind of ivory, but nowadays the skin and blubber of this, as of the other species of the seal family, are also turned to account. A FLYING membrane extends between the long fore-limbs and the short hind-limbs. The dentition consists of all three kinds of teeth. Autor of the post: Undefined The Long-Eared Bat (Plecotus auritus) Post Date: Fri, 15 Aug 2008 22:32:31 +0000 Insect or fruit eating animals (insectivorous or frugivorous). Nocturnal or crepuscular in their habits. The Long-Eared Bat (Plecotus auritus). Autor of the post: Undefined They thus have to bear Post Date: Fri, 15 Aug 2008 22:21:01 +0000 This animal derives its name from the conspicuously large external ears. Bats pass a great portion of their lives traversing the air in search of food (see Section B. They thus have to bear the whole weight of their body (compare with land and water animals), and often even their young, which hang on to the breast of the mother until they are able to go in search of their own food. Autor of the post: Undefined 1 The Bat possesses Post Date: Fri, 15 Aug 2008 22:02:02 +0000 Their mode of locomotion, then, is quite different from that of all other mammals, and we need therefore feel no surprise that their body is constructed in many ways quite differently. Their structure appears, accordingly, strange and peculiar, but on closer examination will be found perfectly adapted to their mode of life and habits. 1 The Bat possesses an Apparatus for Flight. Autor of the post: Undefined It is not as yet Post Date: Fri, 15 Aug 2008 21:45:39 +0000 (a) A flying membrane extends on each side between the body, the fore and hind limbs, and the tail, which equals the body in length. When this is unfolded, the animal rests in the air upon a very large surface. It is not as yet, however, carried by the air. Autor of the post: Undefined Hence the strikingly large size Post Date: Fri, 15 Aug 2008 21:34:11 +0000 This is effected by the constant downward movements of the fore-limbs, each depression of these limbs bringing in its train a con- densation of the atmosphere. The larger the flying membrane, the more easily will the animal be able to support itself in the air, and the more rapidly will it be able to progress. Hence the strikingly large size of the flying membrane. Autor of the post: Undefined The metacarpal bones and fingers Post Date: Fri, 15 Aug 2008 21:22:35 +0000 (What kind of bats are probably the fastest and nimblest in progressing through the air ? Compare with swallow and common fowl.) (b) With the greater breadth of the anterior portion of the flying membrane is correlated a great elongation of the bones of the arm. The metacarpal bones and fingers are likewise elongated, and, after the manner of the ribs of an umbrella, keep stretched that part of the membrane which projects beyond the lower arm. Autor of the post: Undefined It supports the portion Post Date: Fri, 15 Aug 2008 21:11:21 +0000 The thumbs and feet, not being included within the membrane, are not increased in length. From the heel backwards extends a bony process, the spur, not found in any other mammal. It supports the portion of the flying membrane between the legs and the tail. Autor of the post: Undefined ) The membrane, accordingly, is highly Post Date: Fri, 15 Aug 2008 21:00:53 +0000 (c) In the act of fluttering the bat alternately spreads out and folds together its flying membrane. (When is it spread ? when folded ? what is the object of these movements ? Compare with seal.) The membrane, accordingly, is highly elastic, and in order to maintain it in this condition it is carefully lubricated every time the animal sets out on one of its flying excursions, the fat used for this purpose being secreted by special glands situated between the nose and eyes. 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