The Amazing Cuttlefish

Cuttlefish belong to the same family as octopus and squid, but they are considered to have the highest intelligence of any invertebrate. They can see backwards, they use jet propulsion the way submarines do, and they also shoot ink jets for protection. They can change color in seconds to make themselves totally invisible. Cuttlefish have three hearts, one for each of two gills, and the other for the rest of their body. They also amazingly have green blood rather than red, because their blood contains hemocyanin instead of hemoglobin.


Photo: Leonard Low