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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flagthe United Arab Emirates
8%
82%
4%
4%
23
flagSingapore
6%
81%
9%
3%
33
flagGermany
6%
80%
5%
6%
78
flagCanada
7%
80%
9%
3%
55
flagPoland
9%
77%
6%
4%
20630
flagUnknown
6%
76%
11%
4%
63
flagMexico
7%
76%
15%
0%
13
flagNew Zealand
0%
76%
15%
0%
13
flagSwitzerland
10%
73%
10%
5%
19
flagIndonesia
9%
71%
4%
0%
21
flagthe United Kingdom
9%
70%
12%
4%
324
flagIndia
8%
69%
15%
5%
759
flagAustralia
10%
69%
16%
3%
95
flagthe United States
9%
68%
14%
5%
1204
flagMalaysia
7%
67%
22%
2%
40
flagthe Philippines
13%
65%
18%
1%
90
flagSpain
6%
60%
6%
13%
15
flagNigeria
9%
58%
19%
4%
41
flagPakistan
17%
56%
16%
7%
81
flagthe Netherlands
16%
55%
16%
11%
18