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 haemoglobin oxygen transportation.
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2%
88%
5%
2%
34
flagUkraine
6%
87%
4%
2%
47
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6%
81%
9%
2%
43
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80%
7%
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40
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79%
10%
3%
82
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78%
6%
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24522
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4%
4%
520
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11%
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168
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6%
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11%
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63
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11%
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10%
1%
78
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9%
4%
41
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75%
3%
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33
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74%
9%
4%
559
flagSwitzerland
18%
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7%
1%
65
flagIndia
8%
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14%
4%
1277
flagMalaysia
5%
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15%
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71
flagthe United States
8%
69%
13%
5%
1544
flagthe Philippines
15%
62%
18%
2%
134
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11%
61%
16%
6%
109
flagPakistan
20%
52%
14%
8%
134