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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4%
90%
3%
1%
64
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4%
84%
6%
4%
45
flagRussia
3%
80%
8%
4%
86
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79%
7%
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53
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78%
6%
4%
25947
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78%
5%
3%
1097
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77%
8%
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118
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76%
8%
4%
663
flagAustralia
7%
76%
11%
3%
208
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6%
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11%
4%
63
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10%
76%
8%
4%
46
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19%
74%
2%
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47
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11%
73%
9%
2%
143
flagthe United States
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70%
13%
5%
1712
flagIndia
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14%
4%
1466
flagMalaysia
4%
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17%
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81
flagSwitzerland
17%
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6%
121
flagNigeria
13%
62%
14%
6%
168
flagthe Philippines
15%
60%
19%
3%
155
flagPakistan
19%
54%
15%
7%
159