What color is octopus blood?

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Both squids and octopuses have blue blood. They use an oxygen-carrying molecule in their blood called hemocyanin that contains copper. In cold conditions with low oxygen pressure, hemocyanin oxygen transportation is more efficient than hemoglobin oxygen transportation.
Kasia
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68
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83%
4%
3%
252
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80%
5%
4%
24666
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30
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84
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953
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41
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713
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48
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69
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11%
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1333
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13%
4%
630
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69%
15%
3%
78
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10%
59
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9%
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43
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1%
77
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6%
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29
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12%
62%
12%
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32
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15%
56%
17%
7%
64