How are the male Common Eider's courtship vocalizations primarily described?
Answer
A hollow moan or soft cooing notes
The male drake expresses itself during courtship displays using sounds characterized as a strange, almost human-like, hollow moan or a series of soft cooing notes, contrasting with the female's hoarse quacks.

Related Questions
What does the scientific designation *Somateria mollissima* primarily translate to?Approximately what percentage of the world's eiderdown is supplied by Iceland?Which distinction does the Common Eider hold regarding duck species in the Northern Hemisphere?What is the maximum documented dive depth for the Common Eider?How does the Common Eider process prey items like blue mussels?During the incubation period, what proportion of her body weight might a female Common Eider lose?What is the collective term used for the large groups of ducklings cared for communally by female eiders?How are the male Common Eider's courtship vocalizations primarily described?In which year was one of the first documented bird protection laws established concerning a colony of Eiders on the Farne Islands?What physiological feature allows the Common Eider to drink ocean water?