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Octopuses have three hearts, which is partially related to their blue blood. Two peripheral hearts pump blood through the gills to collect oxygen, then a central heart circulates this oxygenated blood throughout the body to provide energy to organs and muscles. Additionally, octopuses have 9 'brains' - one central brain for overall control plus eight smaller ones. For comparison:
- Birds and mammals: 4-chambered hearts (two atria and two ventricles)
- Amphibians like frogs: 3-chambered hearts (one ventricle and two atria)
- Fish: 2-chambered hearts (one atrium and one ventricle)
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