. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Intake Apparatus 273 animals, and even in the case of intellectual man is the actuating motive behind much of his daily behavior. It is no concern of plants. Probably in the majority of cases the capture of food involves some sort of a chase, since the animal as well as its food may be in motion. Herbi- vores have the advantage of depending upon food that is generally sta- tionary, so they simply need to seek it out. Sedentary feeders, on the other hand, r
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Intake Apparatus 273 animals, and even in the case of intellectual man is the actuating motive behind much of his daily behavior. It is no concern of plants. Probably in the majority of cases the capture of food involves some sort of a chase, since the animal as well as its food may be in motion. Herbi- vores have the advantage of depending upon food that is generally sta- tionary, so they simply need to seek it out. Sedentary feeders, on the other hand, remain in one spot, catching motile food that comes their way. Devices of various kinds, therefore, like ciliary whirlpools or stretching ten- tacles, are employed by stationary animals to bring food within range. Many aquatic animals that are not sessile also use cilia to sweep micro- scopic food particles their way. The ciliated fraternity includes protozoans, sponges, anthozoans, bryozoans, rotifers, brachiopods, sessile annelids, brittle-stars, bivalves, pteropods, entomostracans, tunicates, amphioxus, and many larval forms. Many animals that are anatomically able to go in pursuit of food, suc- ceed better by lying in wait for passing food than by bestirring themselves in open chase. They have their breakfast, so to speak, served to them in bed. Such animals frequently develop camouflaging coloration, or, like spiders, construct elaborate snares and traps for their prey. Mucous threads are employed by certain coelenterates and mollusks to entangle food par- ticles that are then engulfed. With the evolution of bilateral symmetry and increased powers of locomotion, "watchful waiting" goes more and more into the discard and pursuit of daily bread becomes the more uni- versal method. When food is finally within reach- ing distance, there are many diverse organs of prehension (Fig. 221), which come into play for seizing it and placing it within the mouth. These adaptati
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Keywords: ., bookcentury1900, booksubjectanatomycomparative, booksubjectverte
