Hawks in immature plumage appear to be:

Hawks in immature plumage do indeed appear smaller than when they reach adulthood, and this size perception can be attributed to their development stages. Young hawks, or immatures, go through significant growth as they mature. During this juvenile phase, their feathers and body structure have not yet reached full development.

In terms of size, while they may not be structurally smaller per se, they lack the full feathering and muscular development associated with adult hawks. As they gain weight and their plumage fills out with mature feathers, they will visually appear larger and more robust.

This information is crucial for falconers, as understanding the differences between immature and adult birds can affect training and handling practices.