What specific feature describes the bare skin on an adult Whooping Crane's head and upper neck?
Answer
Bright red bare skin
Adult Whooping Cranes possess a distinctive appearance on their head and upper neck, which features bare skin colored bright red. Additionally, a notable feature associated with the head is a tuft of black, hair-like feathers drooping down the back of the neck, commonly known as a 'flapper' plume. Juvenile birds, in contrast, exhibit a much duller coloration, being covered in rusty or tawny down that gradually replaces itself with the mature white plumage over the span of their first year of life.

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