HomeGlossary Bird topography Eye-ring A ring of contrasting feathers or bare skin around the eye. A complete versus a broken eye-ring separates several flycatchers and vireos. Bird topographyRelated termsFull glossary Scapulars Feathers on the "shoulder" that cover the join between wing and body on a perched bird. Rump The lower back, just above the base of the tail. Casque A helmet-like growth on top of the bill or head. Speculum A bright, often iridescent patch on the secondaries of many ducks. Supercilium A pale stripe above the eye, often called the eyebrow. Primaries The outermost flight feathers of the wing, attached to the "hand"; they provide most of the forward thrust.
Primaries The outermost flight feathers of the wing, attached to the "hand"; they provide most of the forward thrust.