1. Same as the other cephalopods, Cuttlefish have not one, but three hearts! Two hearts are used to pump blood to the gills, and the third heart is used to circulate oxygenated blood to the rest of the body. 2. Cuttlefish have truly impressive vision Cuttlefish can see what’s behind them. To focus on an object, a cuttlefish changes the shape of its eye, rather than the shape of its eye’s lens, as we do. They have distinctive W-shaped pupils, which allow them to see almost entirely behind them and may even be able to switch between forward-facing and peripheral vision. 3. Camouflaging masters Cuttlefish are referred to as the “chameleons of the sea” due to their color-changing abilities. They can do this even though they are completely color blind. They can even successfully change color to match their surroundings in complete darkness. 4. There Are Over 120 Species of Cuttlefish These animals vary in size from a few inches to several feet in length. The giant cuttlefish is the largest cuttlefish species and can grow to 50cm in length and more than 10kgs in weight. 5. Cuttlefish Have Eight Arms and Two Tentacles The cuttlefish has two long tentacles that are used to quickly grasp its prey, which it then manipulates using its arms. Both the tentacles and arms have suckers. 6. Cuttlefish Have a Short Lifespan Mating occurs in spring/summer with the male transferring a sperm mass to the female’s mantle, where it is released to fertilize the eggs. The female attaches groups of egg onto objects on the seafloor. The female stays with the eggs until they hatch, but both the male and female die shortly afterward. Cuttlefish are sexually mature at 14 to 18 months of age and only live 1 to 2 years. 7. Cuttlefish Propel Themselves With Fins and Water Cuttlefish have a fin that goes around their body, which looks like a skirt. They use this fin for swimming. When quick movement is needed, they can expel water and move by jet-propulsion. #goodiving #scubadivingtenerife #explore #learn #learnontiktok #interesting #facts