Wing-covers and hind-wings are alike absent, and the latter are represented by a pair of little knobbed organs, the halteres or balancers, which have a controlling and directing function in flight. [Please select]
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Hence birds have naturally and rightfully been called the "balancers" in nature. [Please select]
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Halteres: the poisers or balancers: capitate movable filaments in Diptera, situated one on each side of the thorax and representing rudimentary hind wings. [Please select]
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But these vestiges--which are known as the 'balancers'--have a new use, and probably act as organs of hearing as well as to guide the flight. [Please select]
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