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.
Kasia
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5%
88%
3%
1%
53
flagRepublic of Ireland
2%
85%
7%
4%
41
flagSingapore
7%
79%
7%
3%
53
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9%
78%
6%
4%
25290
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9%
78%
5%
3%
795
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10%
3%
191
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78%
8%
3%
107
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8%
5%
60
flagUnknown
6%
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11%
4%
63
flagthe Netherlands
9%
76%
9%
4%
42
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75%
9%
4%
622
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17%
75%
2%
2%
45
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10%
73%
9%
2%
119
flagthe United States
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70%
13%
5%
1636
flagIndia
8%
69%
14%
4%
1402
flagMalaysia
5%
69%
15%
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76
flagSwitzerland
17%
68%
9%
4%
91
flagNigeria
11%
63%
16%
6%
150
flagthe Philippines
14%
60%
20%
4%
150
flagPakistan
19%
55%
14%
8%
150