Cuttlefish have the ability to change color in the same amount of time that you can blink. That means it could camouflage itself and disappear before your very eyes! These animals have three hearts - two of which are used to pump blood to the gills, and one to pump blood to the rest of the body. The two hearts that pump blood to the gills are smaller and essentially help to clean the blood before it is pumped to the body. Also, their blood is blue in color. Cuttlefish have the ability to change color in the same amount of time that you can blink. That means it could camouflage itself and disappear before your very eyes! These animals have three hearts - two of which are used to pump blood to the gills, and one to pump blood to the rest of the body. The two hearts that pump blood to the gills are smaller and essentially help to clean the blood before it is pumped to the body. Also, their blood is blue in color.