Orientation behaviors (tropisms) are specific movements of the entire body so that an animal alters its position in space with respect to external stimulus (Barnard, 2004). Two types of behavioral responses which maintain animals in proper orientation to fundamental stimuli in their environment are recognized. These responses are
A behavioral response is positive if the animal moves towards the stimulus and negative if it moves away from the stimulus. Furthermore, responses are commonly named for the type of stimulus which evokes them. Thus, a phototaxis is a response to light, and a geotaxis is a response to gravity etc.
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