For example, the reason why duck feathers don't touch water is that there is a hydrophobic molecular film on its surface. Because of the nano-structure in nature, the feathers of geese, ducks and geese have nano-particles waterproof structure, so they can float on the water. The feathers of ducks and geese are arranged very closely, and the gap between hairs is so small that water molecules can't pass through their feathers and stick to them.
The difference between human hair and animal hair
1. Animal fur is the result of natural evolution. Hair refers to the silk on animal skin, which is one of the characteristics of mammals. Mammals grow hair to keep warm. Thick fur can keep the body's heat, and it can shed and regenerate with the change of climate and season. At the same time, thick hair can also protect the skin of animals. Protect your skin from injury when you are accidentally scratched by weeds and branches.
2. The core of hair follicle: For animals, the characteristics of the core make the coating of hair not only provide good heat insulation, but also provide considerable rain protection. Thermal regulation characteristics combined with the rough nature of animals, as a good thermal insulation or thermal insulation means, always prevent rain and moisture from acting on animal skin.
3. The growth pattern is also different: in humans, each hair grows independently. For animals, the growth process of hair is often synchronous. Human hair can be cut off according to personal requirements, but animal hair will grow to a certain extent, then it will fall off and be replaced by new hair.
4. Composition: Human hair often has the same texture, while animal hair usually contains double components. In addition to the rough surface of hair or fur, there is a layer of shorter and thinner hair, which is called lower fur. The lower hair is closer to the skin, which helps to provide some temperature control for animals. In addition to helping to keep the animal's body at an acceptable temperature, the underlying hair also helps to protect the roots of long hair from harm.