Bird Wing Feather Anatomy Diagram - Primary, Secondary & Covert Feathers #3904018 (License: Personal Use)

This black-and-white anatomical drawing depicts a fully extended bird wing, clearly distinguishing major feather tracts: alula (c), greater coverts (d), secondaries (e), and primaries (f). The layered arrangement shows how overlapping feathers create aerodynamic surfaces essential for flight. Labels a and b indicate the leading edge and distal margin respectively.

Used in educational biology or ornithology resources to teach avian anatomy; matches user intent for academic study, bird identification, or evolutionary morphology research.