| ABDOMEN: | Ventral part of the bird. Synonym: belly. |
| ALULA: | Three feathers springing from the base of the primaries. Synonym: alular quills. |
| ALULAR QUILL COVERTS: | Feathers overlying the bases of Alula. |
| ALULAR QUILLS: | Three feathers springing from the base of the primaries. Synonym: alula. |
| AURICULAR: | Loose-webbed feathers on the sides of a bird's head and overlying its ear openings. Synonym: ear coverts. |
| AXILLARY: | Ventral area between the body and the wing. Synonym: wingpit. |
| BACK: | Dorsal part of the bird. |
| BELLY: | Ventral part / underside of the bird. Synonym: abdomen. |
| BILL: | Beak. |
| BODY: | Main mass of the bird as distinguished from its wings, feet and head. |
| BREAST: | Front part of the chest. |
| BREAST BAND: | Stripe across the breast. |
| BREAST SPOT: | Small, differently colored area on the breast. |
| CAP: | Top of the crown. |
| CERE: | Fleshy area between the beak and face. |
| CHEEK: | Area bounded by lore, eye, auricular, and lower mandible. |
| CHEST: | Front part of the body. |
| CHIN: | Part of the face below the bill. |
| CLOACA: | The single opening in birds used for both reproduction and excrement. |
| CLOACAL KISS: | Term used to describe copulation. |
| COLLAR: | Rear portion of crown. Synonym(s): nape, hindneck. |
| COMB: | Colored area over eye found in males. |
| COMMISSURE: | Base of the bill where the mandibles join. Synonym(s): gape, rictus. |
| CREST: | Tuft on the head. |
| CRISSUM: | Feathers covering underside of base of tail. Synonym: undertail coverts |
| CROWN: | The top of the head of a bird; the area between its forehead or back of the head. In some birds, it may be called the crest. |
| CULMEN: | Upper ridge on bill. |
| DIHEDRAL: | Wings of a flying bird held at an angle appearing to form a "V." |
| EAR PATCH: | Area around ear opening. Synonym: auricular. |
| EARS: | Rounded, earlike areas on the face. Synonym: facial discs. |
| EYE: | Organ of sight. |
| EYE LINE: | Line of feathers in front of and behind the eye. |
| EYE STRIPE: | An identification marking for a stripe that appears above the eye. |
| EYEBROW: | Line of feathers above the eye. Synonym(s): supercilium, superciliary line. |
| EYELID: | Skin-fold covering the eye. |
| EYERING: | An identification marking applied to a ring around the eye. |
| FACE: | Front part of the head. |
| FACIAL DISCS: | Rounded, earlike areas on the face. Synonym: ears. |
| FEET: | Terminal part of the leg. |
| FLANK STRIPE: | Band on the flanks. |
| FLIGHT FEATHERS: | Primaries and secondaries. |
| FORENECK: | Front part of the neck. Synonym(s): throat, jugulum, throat patch. |
| FRONTAL SHIELD: | Extension of the bill onto the forehead. |
| GAPE: | Base of the bill where the mandibles join. Synonym(s): commissure, rictus. |
| GORGET: | Iridescent throat feathers on a hummingbird. |
| GREATER SECONDARY COVERTS: | Feathers overlying bases of secondaries. |
| GULAR REGION: | Between the chin and the foreneck. |
| HEAD: | Upper part of the body. |
| HEAD STRIPES: | Bold lines on the head. |
| HINDHEAD: | Rear portion of crown. Synonym: occiput. |
| HINDNECK: | Back of the neck. Synonym(s): nape, collar. |
| HORNS: | Paired contour feathers arising from head. |
| INNER PRIMARIES: | Group of primaries closest to the body. |
| INNER SECONDARIES: | Group of secondaries closest to the body. |
| INNER WING: | Shoulder, secondaries and secondary coverts. |
| IRIS: | Colored part of eye. |
| KNEE: | Joint in the middle part of the leg. |
| LEADING EDGE OF WING: | Front edge of the wing in flight. |
| LORES: | Term for a small area on each side of a bird's face, between its eyes and the base of the upper part of its bill. |
| LOWER MANDIBLE: | The lower half of a bird's bill; equivalent to the lower jaw in a human being; used in the plural (mandibles) to indicate both the upper and lower halves of the bill. |
| LOWER MANDIBULAR TOMIA: | Cutting edges of lower mandible. |
| MALAR STRIPE: | Area at the sides of the chin. Synonym(s): whisker, mustache, malar streak. |
| MANDIBULAR RAMUS: | Prong-like, posterior projection from bill. |
| MANTLE: | Upper surface of the wings and the back. |
| MARGINAL COVERTS: | Feathers overlying bases of median secondary coverts. Synonym(s): lesser secondary coverts, shoulder. |
| MEDIAN LINE: | Stripe through the crown. |
| MEDIAN SECONDARY COVERTS: | Feathers overlying bases of greater secondary coverts. |
| MUSTACHE: | Area at the sides of the chin. Synonym(s): whisker, malar streak |
| NAPE: | The back part of the neck. In a bird, the nape is the part of the hind neck just below the back part of the head. |
| NASAL CANTHUS: | Anterior corner of eye. |
| NASAL FOSSA: | Depression in which nostril is located. |
| NECK PATCH: | Inflatable sac on neck used by males in courtship display. |
| NOSTRIL: | External naris. |
| OCCIPUT: | Rear portion of crown. Synonym: hindhead. |
| OPERCULUM: | Swollen structure in pigeons overarching the nostril. |
| OUTER PRIMARIES: | Group of primaries farthest from the body. |
| OUTER SECONDARIES: | Group of secondaries farthest from the body. |
| OUTER TAIL FEATHERS: | Part of the tail farthest from the center. |
| OUTER WING: | Alula and primaries. |
| PINNAE: | Projecting feathers. |
| PLUMAGE: | Body covering, feathers |
| PRIMARIES: | Flight feathers attached to the manus, or the "hand" part of the wing. |
| PRIMARY NUMBERING: | System for assigning a number to each primary. |
| PUPIL: | Contractile aperture in iris. |
| RECTRICES: | Conspicuous feathers forming posterior margin of tail. |
| REMIGES: | See primaries and secondaries. |
| RICTUS: | Base of the bill where the mandibles join. Synonym(s): gape, commissure. |
| RUFFS: | Fringe of feathers growing on the neck. |
| RUMP: | Area between the uppertail coverts and the back. |
| SCAPULARS: | Area of feathers between the back and the wings. |
| SECONDARIES: | Flight feathers attached to the forearm (ulna), nearer the bird's body than the primary feathers. |
| SECONDARY COVERTS: | Feathers protecting and covering the secondaries. |
| SHOULDER: | Feathers overlying bases of median secondary coverts. Synonym(s): lesser secondary coverts, marginal coverts. |
| SIDE: | Area between the belly and the wing. |
| SPECTACLE: | Eye ring and supraloral line together. |
| SPECULUM: | Highly colored area on secondaries of several ducks. |
| SUBTERMINAL BAND: | Stripe before tip of tail. |
| SUPERCILIARY LINE: | Line of feathers above the eye. Synonym(s): supercilium, eyebrow. |
| SUPRALORAL LINE: | Line of feathers above the lore. |
| TAIL: | Feathers A group of flight feathers at the end of the bird. This group of feathers is called the "rectrices" or "steering feathers". |
| TAIL COVERTS: | Under and uppertail coverts. |
| TAIL NUMBERING: | System for assigning a number to each tail feather. |
| TARSUS: | The straight part of a bird's foot immediately above its toes - the part of the foot that bears the toes; it corresponds to the arch of the human foot. |
| TEMPORAL CANTHUS: | Posterior corner of eye. |
| TERMINAL BAND: | Stripe at tip of tail. |
| TERTIARIES: | Feathers adjoining the secondaries. |
| THROAT: | Front part of the neck. Synonym(s): foreneck, jugulum, throat patch. |
| TIBIA: | Part of the leg above the knee. |
| TOE: | Digit attached to the feet. |
| TTRAILING EDGE OF WING: | Rear edge of the wing in flight. |
| UNDERPARTS: | The under surface of the body of a bird from the base of the bill to the root of the tail. |
| UNDERTAIL COVERTS: | Small feathers under the tail of a bird. They are collectively called the "crissum". An example of undertail coverts is the bulbul with it's yellow feathers underneath. |
| UPPER MANDIBLE: | The upper half of a bird's bill. The upper half of the bill is called the "maxilla". |
| UPPER MANDIBULAR TOMIA: | Cutting edges of upper mandible. |
| UPPERPARTS: | The whole upper surface of the body of a bird from the base of the bill to the root of the tail, but not applied to the wings or tail. |
| UPPERTAIL COVERTS: | Feathers covering upperside of base of tail. |
| UPPERWING: | Upperside of wing. |
| WING: | Moveable feathered appendage to the bird body. |
| WING BARS: | Pale tips of greater and median secondary coverts. |
| WING COVERTS: | The small feathers on top of the wings. |
| WING COVERTS: | Primary and secondary coverts. |
| WING LINING: | Median, lesser and marginal coverts on underwing. |
| WING STRIPE: | Paler area at base of flight feathers. |
| WINGBARS: | A term used to describe an identification marking on the wings. Usually a band or stripe of a different color. |
| WINGPIT: | Ventral area between the body and the wing. Synonym: axillary. |
| WRIST: | Area at base of the primaries. |
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