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4 In order to grind Post Date: Thu, 14 Aug 2008 20:17:22 +0000 On account of the postero-anterior movement of the mandibles, the promin- ences of these files, ie, the enamel ridges (see p 16), must be placed open in front, indicated by a dotted line behind. transversely to the longitudinal axis of the jaws ; and since the osseous portion of the teeth offers less resistance than the enamel ridges, the file-like surfaces remain constantly sharp. 4 In order to grind up the food, which is taken in very small bites, only short grinding surfaces are required. Autor of the post: Undefined (b) By this arrangement Post Date: Thu, 14 Aug 2008 20:04:15 +0000 The head of the squirrel, accordingly, like that of all rodents, is not nearly as elongated as that of the larger herbivora (see ox, horse). 5 (a) For gnawing especially strong muscles are required, and to work to the best advantage (to shorten the arm of the lever) these muscles must be inserted as far forward as possible in the lower jaw. (b) By this arrangement the mouth opening is much contracted ; on the other hand, (c) The upper lip is divided as a protection against injury in gnawing, and for the purpose of exposing the upper incisors (hare-lip). Autor of the post: Undefined While eating the animal sits Post Date: Thu, 14 Aug 2008 19:48:43 +0000 6 In order to open a nut or acorn, or to dismember a pine-cone, the squirrel grasps these objects with his fore-paws (see Section A, 2). The presence of a rudimentary thumb almost converts these into hands, and thus renders them still more suited for grasping. While eating the animal sits, or rather squats, on the hinder portion of its body. Autor of the post: Undefined ) 8 Since it conveys Post Date: Thu, 14 Aug 2008 19:29:49 +0000 7 Since the animal uses its fore-limbs as arms, clavicles are present. (Compare with bat.) 8 Since it conveys the food to its mouth with its hand-like paws, the neck is short. Autor of the post: Undefined The oesophagus is narrow Post Date: Thu, 14 Aug 2008 19:10:48 +0000 (Compare with orang-utan and ox.) 9 The salivary glands are large, as in all herbivorous animals (see ox). The oesophagus is narrow and the intestine long. Autor of the post: Undefined Man, who takes pleasure Post Date: Thu, 14 Aug 2008 18:58:13 +0000 Among animals the marten is the fiercest foe of the squirrel. The fox, too, endeavours to circumvent it, and falcons and owls swoop down upon it when they have the chance. Man, who takes pleasure in the varied antics of this " monkey of our woods," has long recognised that in the squirrel he is dealing with a serious destroyer of the forest. Autor of the post: Undefined 1 Its arboreal life Post Date: Thu, 14 Aug 2008 18:47:05 +0000 The forester might perhaps be inclined to overlook the destruction of his seeds, but when he finds the young shoots of his pines and firs bitten off, young trees, which he has reared with much trouble, killed by having their bark gnawed away, the nests of his most useful helpmates, the feathered songsters, despoiled, we need not wonder at his wrath and his endeavours to destroy the spoiler wherever he can. Nature, however, has equipped the squirrel with various means of protection against its enemies. 1 Its arboreal life is in itself a protection, for neither fox nor man can follow it to its lofty domain. Autor of the post: Undefined 3 Its reddish-brown coat renders Post Date: Thu, 14 Aug 2008 18:35:54 +0000 2 Its extraordinary agility, excelling even the marten (which see) in leaping and climbing. Birds of prey it usually eludes by rapidly climbing up the trunks of the tree in spiral lines, whereas its pursuers can only fly round in larger curves. 3 Its reddish-brown coat renders it almost unnoticeable on pines and fir-trees, especially since its lighter-coloured under-side is covered by the stem or branches. Autor of the post: Undefined With its erected ears Post Date: Thu, 14 Aug 2008 18:20:58 +0000 In the North (Lapland, Eussia and Siberia) its fur during the snowy winter becomes whitish-gray (minever). 4 Its sharp senses enable it to detect an enemy even at a distance. With its erected ears, which are provided with a pencil of hairs, the so-called "horns," it can easily detect the slightest sound, and with its keen and watchful eye it constantly surveys from its lofty watch-tower its immediate surroundings. Autor of the post: Undefined As a rule Post Date: Thu, 14 Aug 2008 18:04:38 +0000 The hairs over the upper lip indicate a well-developed sense of touch. 5 By the aid of the hand-like fore-paws it constructs a protective nest out of brushwood. As a rule, this is placed on the main trunk in the fork of a large branch, since from such a situation it can easily effect its escape. 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