What is the color of the flanks (area under the wings) on a standard wild-type male Zebra Finch?
Answer
Rich chestnut dotted with white spots
The flanks, which are the areas situated under the wings on the sides of the bird, possess a very specific coloration in the standard wild-type male Zebra Finch. These areas are described as being a rich chestnut color. This chestnut base is further ornamented by numerous white spots scattered across it, contributing significantly to the male's overall flashy appearance that contrasts with the more subdued female. This marking is distinct from the black and white barring found on his throat and chest.

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