Schusterman R J, Gentry R, Schmook J
Science. 1966 Oct 28;154(3748):540-2. doi: 10.1126/science.154.3748.540.
Underwater vocal response of three sea lions (Zalophus californianus) increased under conditions of social interaction. When confronted by their mirror images, two animals increased their number of vocalizations, which included "whinny" sounds, barks, buzzing, and varying patterns of click trains. Click vocalizations showed habituation and recovery when the animals were in the presence of the mirror stimulus.
三只海狮（加利福尼亚海狮）在社交互动条件下的水下发声反应有所增加。当面对自己的镜像时，两只海狮增加了发声次数，包括“嘶鸣”声、吠叫声、嗡嗡声以及不同模式的咔哒声序列。当动物处于镜像刺激存在的情况下，咔哒声表现出习惯化和恢复现象。
