What describes an immature bald eagle?

An immature bald eagle is characterized by its mostly dark head and tail, along with mottled or banded wings. Unlike adult bald eagles, which are known for their distinctive white heads and tails and dark brown bodies, immature eagles do not develop these mature plumage traits until they are around 4 to 5 years old. The mottled wings reflect the transitional stage of their development, as their feathers can vary significantly from those of the adults, showcasing a mix of brown and white hues.

The other characteristics mentioned in the options do not accurately describe an immature bald eagle. Predominantly white feathers are typical of mature adults, while a small size with a bright yellow beak doesn't apply here—immature bald eagles are generally similar in size to adults, but their beaks are darker and less pronounced. Lastly, dark wings with no white would only describe certain other bird species or perhaps a stage earlier in their development, but does not capture the mottled aspect of immature bald eagles.