In the emperor penguin courtship call, male vocalizations are composed of long, slow bursts with lower frequency tones than the female version. But calls of SeaWorld San Diego male penguin E-79 defied this binary. Also unusual was this penguin's male companion, E-81. The pair 'kept company' and sometimes exhibited ritual courtship displays.
The emperor penguin courtship display includes strutting, bowing, emitting the distinctive call, and swinging the head. This courtship display is also exhibited in other social contexts, especially around chicks and juvenile penguins. "We found that if we looked at the bursts overall, they were structured mainly like the male-type calls, but they contained little initial amplitude peaks in front of many bursts and a series of very short peaks in one of the long central bursts that would not have been typical of adults of either sex," Seger said.
Source: News Formal (newsformal.com)
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