Eider articles
What is the primary visual clue regarding size when identifying an eider duck in the water?
What specific plumage feature helps lock in the identification of a male Common Eider's head pattern?
What feature primarily distinguishes a male King Eider from a male Common Eider on the head and bill?
What is the general appearance of female eiders?
When separating a female Common Eider from an American Black Duck, what structural difference is noted?
What is the defining characteristic of the bill structure common to all eiders?
What type of vocalization is known for the male Common Eider?
How does the nape plumage of the male Common Eider differ from the head coloring of the male King Eider?
In which type of environment are eiders strongly associated?
What key facial feature is present across several female eider species, including the Common Eider?
What is consistent regarding the heavy structure and mass of eiders across both sexes?
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?
What is the primary reason Eiders congregate in very large flocks during the non-breeding season?
What behavior characterizes the male Common Eider once incubation of the eggs begins?
In areas where eiderdown is traditionally harvested, what does the perceived 'friendliness' of the nesting females actually represent?
Where is the down naturally collected from the female Eider deposited?
Which defense mechanism is specifically mentioned as being available to the female Eider for protection?
What type of environment do Eiders prefer and where are they rarely encountered?
What is the consequence if a sudden approach is made by an unfamiliar human near a non-protected Eider?
What is the core difference between the social comfort and individual disposition of Eiders regarding humans?
What behavior change occurs in the female Eider when an intruder gets too close to her clutch while she is guarding her nest?