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Thus, bats whose eyes had Post Date: Fri, 15 Aug 2008 17:59:38 +0000 Compare, on the other hand, the eyes of the owl. 2 The sense of touch, on the other hand, is developed to a degree almost inconceivable to human beings. Thus, bats whose eyes had been covered with sticking-plaster, and who were then let loose in a room in which a large number of threads were extended, never once collided with the latter. Autor of the post: Undefined In the same way Post Date: Fri, 15 Aug 2008 17:46:57 +0000 This can only be explained by assuming that the animals are sensible to the vibrations of the air generated by the stroke of their flying membranes and reflected by surrounding objects. The fineness of the threads in the above experiment itself shows how faint such vibrations must be. In the same way the animal becomes sensible of the faint, air vibrations generated by a flying insect. Autor of the post: Undefined The existence of this sense Post Date: Fri, 15 Aug 2008 17:28:24 +0000 It feels its prey, as it were, from afar. This extremely fine sense of touch has its seat in the flying membrane, in the delicate pinnae of the ears, and the covers placed in front of the external auditory aperture. The existence of this sense also renders intelligible the unusual size of the external ears and the absence of the thick coating of fur from them as well as from the flying membrane. Autor of the post: Undefined (Why ?) The large pinnae Post Date: Fri, 15 Aug 2008 17:12:41 +0000 3 The sense of hearing is equally acute, as is, indeed, shown by the voice of the animal, which is so fine and high-pitched that many people are unable to perceive it at all. The creature, on the other hand, must be able to hear tones of this kind. (Why ?) The large pinnae, which are movable and capable of being laid back, in fact, represent ear-trumpets. Autor of the post: Undefined ) Animals endowed with a fine Post Date: Fri, 15 Aug 2008 17:00:59 +0000 At the commencement of the aerial voyage they are erected, and probably enable the animal to hear sounds inaudible to human ears, such as the flight of a moth, more especially as the animal itself moves without sound. (Compare with cat and owl.) Animals endowed with a fine sense of hearing cannot tolerate loud tones or noises. Autor of the post: Undefined 4 The bat catches its Post Date: Fri, 15 Aug 2008 16:47:16 +0000 (Compare the dog.) Hence, according to some naturalists, the ear-covers of the bat, by closing the auditory passage, save the animal from being annoyed or tormented by sounds or noises of this description. 4 The bat catches its prey while flying, consequently the mouth is ividely cleft. Autor of the post: Undefined The molars have pointed cusps Post Date: Fri, 15 Aug 2008 16:30:16 +0000 (Compare the swallow.) 5 The teeth have the appearance of rows of needle-points. The molars have pointed cusps. Autor of the post: Undefined Since the points Post Date: Fri, 15 Aug 2008 16:18:14 +0000 They, as well as the long dagger- shaped canines, are able to bore with ease through the hard wing-covers and the armour of larger insects, from which blunt teeth would glide off. The animal uses its teeth neither for gnawing nor grinding (like a herbi- vorous animal), but merely for biting and boring. Since the points of the teeth of one set are received in the interstices of the other set, the crowns are not worn down by use. Autor of the post: Undefined 7 The neck is very Post Date: Fri, 15 Aug 2008 16:01:43 +0000 (Compare with cat.) 6 The animal diet corresponds to the short intestine, only three times as long as the body. 7 The neck is very short. Autor of the post: Undefined A large animal could not Post Date: Fri, 15 Aug 2008 15:50:16 +0000 A long neck, by which the head is enabled to move in all directions (compare the stork), would be useless to a bat, which in the pursuit of prey during flight can easily turn head and body together in any direction it pleases (compare the swallow). 8 With the nature of the food is also correlated the small size of the animal. A large animal could not obtain enough insects to satisfy itself. 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