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'''Hunting''' is a self-exciting [[oscillation]] of a physical system, commonly that of systems incorporating [[feedback]]. It also occurs as an uncomfortable phenomenon in [[rail transport|railway]] [[wheel]]s. A similar phenomenon in automotive [[tire]]s is known as [[speed wobble|shimmy]].
For a mathematical analysis of the phenomenon in the context of railway vehicle dynamics, see [[Hunting oscillation]].
An example of the phenomenon occurred in early [[automatic transmission]] designs. At certain speeds the transmission system, currently being in a "higher gear" would decide that operation in a "lower gear" would more desirable and would switch to the lower gear. Having reached the lower gear setting, the transmission then decides that operation in a higher gear would be better and switches back. The result was a continuous up-and-down shifting behavior at certain speeds that was not only annoying but hard on the transmission. Such behaviors can be inhibited by introducing [[hysteresis]] into the system.
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