. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . eaurchins. Those mammalslike the horse and cow, thatfeed on plants, have usuallybroad chisellike incisor teethfor cutting off the foliage,and teeth of very similarform are developed in dif-ferent groups of plant-eatingfishes. Molar teeth are foundwhen it is necessary that thefood should be crushed or chewed, and the sharp canine teeth go with a flesh diet. Thelong neck of the giraffe enables it to browse on the foliage oftrees in grassless regions. Insect
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . eaurchins. Those mammalslike the horse and cow, thatfeed on plants, have usuallybroad chisellike incisor teethfor cutting off the foliage,and teeth of very similarform are developed in dif-ferent groups of plant-eatingfishes. Molar teeth are foundwhen it is necessary that thefood should be crushed or chewed, and the sharp canine teeth go with a flesh diet. Thelong neck of the giraffe enables it to browse on the foliage oftrees in grassless regions. Insects like the leaf-beetles and the grasshoppers, that feedon the foliage of plants, have a pair of jaws, broad but sharplyedged, for cutting off bits of leaves and stems. Those whichtake only liquid food, as the butterflies and sucking bugs,have their mouth parts modified to form a slender, hollowsucking beak or proboscis, which can be thrust into a flowernectary, or into the green tissue of plants or the flesh of animals,to suck up nectar or plant sap, or blood, according to thespecial food habits of the insect. The honey-bee has a very. FIG. 189.—The brown pelican, showing gularsac which it uses in catching and holdingfishes for its food. 330 EVOLUTION AND ANIMAL LIFE complicated equipment of mouth parts fitted for taking eithersolid food like pollen, or liquid food like the nectar of mosquito has a bill* composed of six sharp, slenderneedles for piercing and lacerating the flesh, and a longtubular under lip through which the blood can flow into themouth. Some predaceous insects, as the praying horse (), have their fore legs developed into formidable graspingorgans for seizing and holding their prey.
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