What color is typically described for the inside of the Willow Flycatcher's mouth, or gape?
Answer
bright orangish or orange-yellow
Beyond the coloration of the external feathers and bill structure, the bare parts of the bird provide additional static clues for identification. While the iris is consistently brown and the legs and feet are dark (dusky brown to blackish), the internal structure of the mouth offers a distinct marker. The inside of the mouth, referred to as the gape, is typically described as being bright orangish or possessing an orange-yellow hue. This brightly colored gape contrasts with the darker bare parts found elsewhere on the head and legs.
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