I've noticed that the blue color of wild western swifts in our local area changes dramatically dependent upon the location they are found in. Furthermore, some of the wc animals that were really blue years ago and are now running wild on the walls around my yard aren't as blue as they used to be. They seem to be prospering, in good health and breeding successfully, so I have to assume either their diet has changed, or something in their prey's diet has changed that is effecting their blue colors.

With that in mind, does anyone know of any research or scientific information on what dietary/environmental influences may be involved in the colors of these lizards, or generally what is in a lizard's diet that can enhance their natural blue colors?

Thanks,
Roger

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