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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flagthe United Arab Emirates
7%
85%
3%
3%
27
flagRepublic of Ireland
5%
84%
5%
5%
19
flagSingapore
5%
82%
10%
2%
39
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6%
82%
6%
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29
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9%
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65
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20
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78%
4%
4%
238
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77%
6%
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22439
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63
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75%
13%
2%
127
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73%
10%
4%
402
flagIndonesia
9%
72%
4%
0%
22
flagIndia
8%
70%
14%
4%
973
flagthe Netherlands
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11%
7%
27
flagthe United States
8%
69%
13%
5%
1336
flagMalaysia
7%
68%
18%
3%
54
flagAustria
11%
67%
14%
2%
34
flagNigeria
8%
64%
16%
4%
50
flagthe Philippines
14%
62%
19%
1%
107
flagPakistan
20%
56%
14%
7%
100