Innermost secondaries (normally 3) that often have a different shape than other secondaries and are sometimes molted on a different schedule.
Innermost wing coverts, often covering secondaries.
flight feathers attached to upper arm (humerus)
Innermost wing coverts, often covering secondaries
innermost flight feathers on a bird's 'upper arm' (humerus). Often applied incorrectly to modified, conspicuous inner secondaries, e.g. those of pipits. The third set of flight feathers located closest to the body.