Jul 3, 2021
Why do ducks have blue wing flashes?
Why do ducks have blue wing flashes?
Mallard (Anas platyrhynchos) 6 June 2021 Beds, UK. Photo by Raymond JC Cannon Many types of dabbling ducks have iridescent wing patches called specula (singular: speculum). These flashes are usually blue or green, although the colour can vary somewhat according to the angle and the lighting conditions. Ducks can also control the extent to which these flashes are visible when their wings are…
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