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%
84%
3%
3%
26
flagRepublic of Ireland
5%
83%
5%
5%
18
flagSingapore
5%
82%
10%
2%
39
flagCanada
7%
80%
7%
3%
63
flagSwitzerland
7%
80%
7%
3%
26
flagGreece
5%
80%
10%
5%
20
flagPoland
9%
77%
6%
4%
22123
flagGermany
10%
77%
4%
4%
199
flagUnknown
6%
76%
11%
4%
63
flagAustralia
8%
75%
13%
2%
124
flagthe United Kingdom
9%
73%
10%
4%
382
flagIndonesia
9%
72%
4%
0%
22
flagAustria
13%
72%
4%
4%
22
flagthe United States
8%
69%
14%
5%
1313
flagIndia
8%
69%
14%
5%
917
flagthe Netherlands
12%
68%
12%
8%
25
flagMalaysia
7%
67%
19%
3%
52
flagthe Philippines
15%
62%
18%
1%
102
flagNigeria
8%
62%
16%
4%
48
flagPakistan
17%
56%
14%
7%
95