H Hawkie Forum Veteran Apr 1, 2025 #1 Octopuses have three hearts and blue blood! Two hearts pump blood to the gills, while the third pumps it to the rest of the body. Their blood is blue because it contains hemocyanin, which is copper-based instead of iron-based like human hemoglobin.
Octopuses have three hearts and blue blood! Two hearts pump blood to the gills, while the third pumps it to the rest of the body. Their blood is blue because it contains hemocyanin, which is copper-based instead of iron-based like human hemoglobin.