Read e-book online Animal Behavior (Natural History Library) PDF

By John Paul Scott

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There is a tendency for an organism to respond to only one stimulus at a time, no matter how many may be occurring in the environment. The sfudy of stimulation. The stimulus-response theory suggests a way of dividing up the study of behavior. The idea of stimulation leads to a study of the causes of behavior. External stimuli enter the body through the sense organs, and we immediately find that animals difier widely in their sensory capacities. The euglena has a light+ensitive spot, but there is no evidence that it can detect changes in the color or form of objects.

DIFFERENTIAL CAPACITIES 4! enough to make contacts at a distance from the body. In nocturnal urammals like rnice and cats the vibrissae, or nose hairs, are used to feel out objects in the dark. The coelenterates also show the fust true tactile organ, the tentacle. Every polyp and jellyf,sh has a circle of these around its mouth. When we touch one with a needle, it quickly contracts, showing sensitivity to contact. The fleshy tentacles on the head of a marine nereid wonn react in the same way. The "horns" of snails are really tentacles which also carry the eyes.

Sehneirla, who followed the wanderings of army ants in the same locality. Such opportunities are rare in any scientist's life, but luckily there are animals closer at hand which can be effectively studied. A number of years ago we lived on a small farm in Indiana and bought a couple of sheep in order to keep down the weeds and grass in the pasture. There was more than enough room for the sheep, and they could be allowed to wander around, feeding and taking shelter at will, with very little human care or interference.

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Animal Behavior (Natural History Library) by John Paul Scott

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