What does immature plumage include for young raptors?

Immature plumage in young raptors typically refers to the feather coloration and structure that differs from that of adult birds. Young raptors often experience what is known as transitional or immature plumage, which can include features such as longer flight feathers. These longer flight feathers are crucial as they contribute to the young bird's development and ability to fly better, allowing them to hunt and forage effectively as they mature.

Brighter colors would usually be associated with mature birds during mating displays or identification but aren't characteristic of immature plumage. A smaller wingspan or less weight is more reflective of the overall size and physical development stage of the bird rather than the plumage, which is about feather structure and appearance. Thus, the development of the longer flight feathers in immature plumage is a key aspect that helps young raptors in achieving flight capabilities necessary for their survival.