Seeing the whale's body, covered with very dense barnacles, will always make us feel numb, especially want to use a knife to help him pick off all the barnacles. Barnacles in it is a larva, will swim to the surface of the whale's body, it will use its head, and the back plate to the whale's skin inside the drill, after the success of the barnacles will begin to secrete a very strong glue, will be glued to the surface of the whale's side of the growth, while using the back plate of the children continue to the whale's lower skin initiated into the skin, and finally invade the skin of the barnacles it will be down the back plate, or inward to close completely. Finally, the barnacles invade the skin, the back plate of the barnacle will be downward, or inward, completely attached to the surface of the whale, and its skin into one, if the barnacle is pulled down hard, the whale's body will leave a big scar. As the whale grows and its skin metabolizes, the barnacle must continue to extend downward, and its back plate will increase in size, otherwise it will probably fall off the whale's body, as you can imagine, the whale is very difficult. A creature constantly embedded in its own skin and growing. It must be particularly itchy. As we see on TV, when a whale leaps out of the water and slaps back into the water, making a big wave, it's not playing, it's just tickling itself. Large whales can remove barnacles from their surfaces by jumping out of the water and diving into the deep sea. Whales can get rid of some of the barnacles by jumping up and slapping the surface of the water, rubbing against their own kind, and rubbing against the sand and gravel on the bottom of the sea, leaving barnacle marks on the body of some whales. Like some large cetaceans, there is another method, such as sperm whales, their size is very large, weighing about 20 tons, speed is not particularly fast. It is an ideal target for barnacle parasitism, but the fact that the sperm whale is very clean with very few barnacles attached to it is because it dives to depths of about 3,000 meters every day, and the most special construction of sperm whales is that they can easily cope with very high water pressures, however, like barnacles, the flesh is most likely not able to withstand such a high pressure. These amputated animals are removed when the sperm whales finish going deep.