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Hemocyanin pigment contains high copper levels in it. Due to the copper content in this pigment, blood appears blue in color. Examples of animals having blue blood are crustaceans, squid, and octopuses. Crustaceans, squid, and octopuses have a blood color of blue.
Blue blood is found in octopuses and horseshoe crabs. This is due to the fact that hemocyanin, the protein that transports oxygen in their blood, is blue.