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並前往https://www.allaboutbirds.org/news/what-can-cause-birds-to-show-weird-color-variations-such-as-being-all-or-partly-white-or-unusually-dark/

What can cause birds to show weird color variations?

Unlike humans, animals without melanin may have other pigments, so they may still have some color. This means that a “true albino” bird may not necessarily be ...

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