wing![click to hear](/images/speaker.jpg)
Appendage of flight formed of hollow bones and feathers, and comprising the forelimb; in certain species, the wing is not adapted for flight.
secondaries ![click to hear](/images/speaker.jpg)
Rigid feather of flight inserted into the central portion of the wing; it protects the primaries when the wing is folded.
greater covert ![click to hear](/images/speaker.jpg)
Covert feather at the base of the wing protected by the middle coverts when the wing is folded.
scapular ![click to hear](/images/speaker.jpg)
Shoulder feather inserted into the edge of the back.
tertial ![click to hear](/images/speaker.jpg)
Rigid feather of flight inserted into the inner portion of the wing; it helps to decrease air turbulence.
middle primary covert ![click to hear](/images/speaker.jpg)
Short feather covering the base of the secondaries; it maintains the body’s internal temperature and allows air to glide over the wing.
primaries ![click to hear](/images/speaker.jpg)
Rigid feather of flight inserted into the outer portion of the wing; it provides propulsion.
lesser covert ![click to hear](/images/speaker.jpg)
Covert feather at the base of the wing arranged in rows and highly exposed to wind action.
middle covert ![click to hear](/images/speaker.jpg)
Covert feather at the base of the wing; it is protected by the lesser coverts when the wing is folded back.
alula ![click to hear](/images/speaker.jpg)
All the short wing feathers inserted into the thumb; they provide stability during slow flight.
primary covert ![click to hear](/images/speaker.jpg)
Short feather covering the base of the primaries; it maintains the body’s internal temperature and allows air to glide over the wing.