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This Blue Morpho butterfly does not have any blue pigment. Instead, its blue color is produce by the interference of light waves. Are there any animals that do have blue pigment?

Answer:

The blue colors of birds, mammals, butterflies, and many other animals are produced by interference of light waves, not by pigments. There are a few animals that do have blue pigments such as lobsters, crabs, jellyfish, mollusks, and octopi.
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