Just like humans, sperm whales will have poor digestion if they suffer from stress. Because of poor digestion, the foods they ate will remain undigested. These foods will eventually become chunks. When the whales excrete them, they will float in the sea and go through photooxidation. It has to do with chemical reactions caused by radiant energy. Through this process, the excretions will become a special substance called ambergris. Because it smells sweet, it is widely used in perfumes.