What do the range map colors mean in the Bird Guides?

You can find a key to the range map colors inside the front cover of the bird guides. An easy way to remember the color scheme is that red (warm color) means summer range, blue (cool color) means winter range. Where birds are resident (summer and winter) the two colors combine to make purple. Yellow indicates areas where the species is found only on migration, and drab olive-gray indicates areas where the species occurs only as a rare visitor.

The color key to Range Maps from inside the front cover of the Sibley Guide to Birds

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