The scarlet ibis is another bird that requires crustaceans for their vibrant red color to be maintained.
As for turtles, I remember years ago when John Iverson wrote and told me that the plastron color of hatchling eastern muds was directly related to the diet of the female while she was forming the egg. That is why some hatchlings have bright orange plastrons while others are a dull yellow. But then there must also be some genetics involved as a friend who hatches many redcheeks each year gets both yellow and red plastroned babies from adults that are fed the same diet.
You can go crazy at a good fish store with the various foods for marine fish. Most turtles love all of them but they tend to be expensive and messy.

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