La vie animale dans la mer et sur la terre . inconvénient. 6. Une autre disposition pour rongeant est illustré dans le re-rangement de la bouche, de la mâchoire inférieure étant attachée au crâne de manière à faire glisser vers l'arrière et à l'arrondissement, ce qui aide dans le processus. Les castors et les écureuils. 389 7. Les barrages de castors.-comme cela a été dit, les castors voir re-intelligence remarquable dans la construction de leurs maisons, et theyarrange-les de sorte que l'entrée peut être à tout moment être-i les l'eau. Lorsque la maison du castor est de astream ou d'un lac assez profond pour assurer cette importante l'ob-jet, il n'est pas nécessaire pour un barrage, ou pour t

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Animal life in the sea and on the land . inconvenience. 6. A further provision for gnawing is shown in the ar-rangement of the mouth, the lower jaw being attached tothe skull in such a manner as to slide backward and for-ward, thus aiding in the process. BEAVERS AND SQUIRRELS. 389 7. Beaver Dams.—As has been stated, beavers show re-markable intelligence in building their homes, and theyarrange them so that the entrance may be at all times be-neath the water. When the home of the beaver is in astream or lake deep enough to secure this important ob-ject, there is no necessity for a dam, or for the erection ofhouses, and their dwellings are then hollowed out in thebanks. But if the stream is shallow, dams are needed tostore up a sufficient quantity of water to conceal the en-trance to their homes, as well as to prevent the possibilityof its being blocked by ice. 8. In order to build these dams, trees must be cut downand dragged or floated to the spot; stones and lumps ofearth are then brought to keep the timbers and boughs in. Fig. 268.—Skull of a Bkaver. place, and everything is securely fastened. Twigs andpieces of wood are also stored up for winter food in casethe beavers should be compelled to resort to such in-doorfare. 9. Their Sagacity in Cutting Timber.—All the wood-cut-ting, as we have seen, is done with the sharp front teeth, and it is accomplished very rapidly. Sitting upon thetail and haunches, a single beaver gnaws a circle around 390 ANIMAL LIFE IN THE SEA AND ON THE LAND. the trunk of a tree, going round again and again, gnawingthe groove deeper each time. At length, when the trunkis cut nearly through, after examining it frequently, thecareful worker nibbles only upon the side towards whichit wishes the tree to fall, taking care to dash away at thefirst cracking of the timber, that it may not be crushedby the falling weight. The trunk is next cut into thedesired lengths and dragged to the water, that it may befloated to the dam. When large trees ar

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• bookcentury1800
• bookdecade1880
• booksubjectzoology
• bookyear1887