What is the most reliable immediate visual check to separate the Orange-headed Tanager from the male Western Tanager?
Answer
The Orange-headed Tanager's body is consistently blue-gray, never solid yellow
The Orange-headed Tanager's body is consistently blue-gray, whereas the male Western Tanager has a clean, bright yellow body, making the body color difference the most reliable immediate separation.

Related Questions
What is the primary color contrast observed in the male Orange-headed Tanager's plumage?Which continent is the native habitat of the Orange-headed Tanager (*Thraupis guanayana*)?How does the female Orange-headed Tanager's head coloration typically compare to the male's?Which phrase best describes the general body structure of the Orange-headed Tanager?What is the most reliable immediate visual check to separate the Orange-headed Tanager from the male Western Tanager?What type of forest environment does the Orange-headed Tanager generally prefer within its range?According to the text, which color tone generally dominates the *Thraupis* genus makeup compared to the *Piranga* genus?What is the description of the Orange-headed Tanager's bill?If a male tanager has a brilliant scarlet-red head and a clean, bright yellow body, which species is it likely to be, rather than the Orange-headed Tanager?How would the plumage of a juvenile Orange-headed Tanager typically appear compared to an adult male?