Lobsters, like snails and spiders, have blue blood due to the presence of haemocyanin, which contains copper.[5] (In contrast, mammals and many other animals, have red blood due to the presence of haemoglobin, which contains iron.)
Octopuses have three hearts. Two pump blood through each of the two gills, while the third pumps blood through the body. Octopus blood contains the copper-rich protein hemocyanin for transporting oxygen.
Squid have three hearts. Two branchial hearts, feeding the gills, each surrounding the larger systemic heart that pumps blood around the body. The hearts have a faint greenish appearance and are surrounded by the renal sacs - the main excretory system of the squid.
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