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Region: The East Pacific
There are actually critters on earth with blue blood, and even white blood! I think there are other colours too, but I'd need to find the PBS Eons video again to be sure.
Edit: I found the video https://www.youtube.com/watch?v=DdjN4ddnl2E
Euricanis, Pakitsk, Peatiktist, Danelaw Scandinavia, and 3 othersSicilianzo, Cafe Hell, and Myehn