This ink is also toxic or poisonous to our enemies such as sharks. Octopus have eight of these tentacles. The cuttlefish and nautilus have many. The tips of these tentacles are so sensitive that we can tell the difference in size, shape and texture of objects. I and all my cousins breath through gills, and have three hearts.
Most cephalopods have separate sexes and fertilization is internal.
Sometime later, the female then lays eggs. Many cephalopods are good mothers and stay with their eggs until they hatch. They keep clean, fresh water flowing over the eggs and caress them to keep them clean of derbies. The young hatch out as perfect small copies of their parents. Some cephalopod cans swim faster than fish.