Maps of distribution: what the colors mean?

There is some color shading on the maps of observations for each taxon. The colors seem not to correspond with observations or the real distribution of the taxon (example here: Moreover, the colors change and disappear during zooming into the map without any apparent pattern:

Is there a documentation for the meaning of the colors?


Thanks! That solves it.
EDIT: I guess zooming color change is bug?

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Different zoom levels use different checklists. If you’re far out, they are country-level checklists, a little closer and they’re state-level, and even closer they become county-level. In your example, Mexico disappears because it has a country-level listing, but no individual state-level listings.


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