What degree of sexual dimorphism is noted between male and female Western Kingbirds?
Answer
Little to no sexual dimorphism in color or size
A key characteristic noted for the adult Western Kingbird is the remarkable similarity between males and females regarding their coloration and overall size. The text explicitly states that the sexes share the basic pattern of pale gray upperparts contrasting with a bright yellow underside, showing little to no sexual dimorphism. This lack of obvious visual difference between sexes means that observers often cannot reliably separate a mating pair based on plumage alone and must rely instead on observing their specific behaviors or interactions to confirm gender.
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