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If you look closely at this bird you will see its coloring looks painted on. Nothing was done in post-processing to promote this. It is a result of the way the sensor handles repetitive patterns (moire).
If you have ever seen a person on TV with a patterned/stripped shirt and seen the lines “travelling” on their shirt, that is moire.
This is another example of a problem (like noise) that some professionals might agonize over. Sometimes moire can add a different and unusual texture to your photographs without the use of fancy software filters.
You can avoid moire by getting closer to your subject, changing your angle and focusing on the eyes or hard detail, as opposed to diffused detail like feathers. As you can imagine these solutions are not always possible when shooting birds. So either it bothers you and you delete the photograph, or you decide to live with an anomaly.