Objective To test both normal adult fenrrets and mature ferretswhose pinna and concha had been removed bilaterally in infancy for their ability to localize sound relatively in the horizontal plane.

• 目的研究正常雪貂和自幼切除耳廓和部分外耳道的雪貂对水平方向声音的相对定位能力，研究耳廓外耳道对它的影响。