| Auriculars | Loose-webbed feathers on the sides of a bird's head and overlying its ear openings. These feathers are also called "ear coverts". |
| Belly | Or abdomen. That part of the undersurface of a bird's body from the breastbone to the vent or to the opening of the digestive tract. |
| Crown | The top of the head of a bird; the area between its forehead or back of the head. In some birds, such as the Blue Jay, it can be called the crest. |
| Eye Stripe | An identification marking for a stripe that appears above the eye. |
| Eyering | An identification marking applied to a ring around the eye. |
| 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. |
| Mantle | A term for the plumage of the back of a bird and the wing coverts on the top of its wings, especially applied to hawks and gulls; specifically the feathers of the back and the folded wings. |
| 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. |
| Primaries | Flight feathers attached to the manus, or the "hand" part of the wing. |
| Scapulars | A group of prominent feathers arising from a bird's shoulders. |
| Secondaries | Flight feathers attached to the forearm (ulna), nearer the bird's body than the primary feathers. |
| Tail Feathers | A group of flight feathers at the end of the bird. This group of feathers is called the "rectrices" or "steering feathers". |
| 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. |
| 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 Gray Catbird with it's rusty-red or chestnut feathers underneath. |
| Upper Mandible | The upper half of a bird's bill. The upper half of the bill is called the "maxilla". |
| 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 | Small feathers over the tail feathers. |
| Wing Coverts | The small feathers on top of the wings. |
| Wingbars | A term used to describe an identification marking on the wings. Usually a band or stripe of a different color. |