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More of a physical observation than a natural one but this is something I would love to have explained to me.
On several occasions I have been surprised to see that when a kingfisher flies away from me low over the water its reflection is not orange but blue. Yesterday I found a kingfisher perched at Radipole Lake as I walked to work in Weymouth and made a particular point of watching it carefully as it flew away. At first, when the bird was flying directly opposite me I could see the reflection of its orange underparts, as you would expect. Then as it flew further away the reflection changed to blue until I was seeing a perfect image in the water of its bright blue back. The bird was flying very close to the water on a perfectly calm morning with the sun behind me low in the sky.