What environmental factor is suggested as a main driver for the clinal variation observed across subspecies coloration?

Answer

Differing light levels, dietary pigments, or temperature

The gradual shift in feather coloration across the range suggests evolution driven by regional environmental pressures such as how much sunlight penetrates the canopy or subtle differences in available pigment sources in the local diet.

What environmental factor is suggested as a main driver for the clinal variation observed across subspecies coloration?

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birdanimalOriginSenegalParrot