Why do so many animals walk on the surface of the water and on the walls?

Spiders climb walls by adhesion, while water striders walk on water by surface tension and fluid resistance. These support forces are only related to the insect-water surface or spider-wall contact area; Their reaction force - gravity - is only related to the mass of these animals. So, in general, large animals are more controlled by gravity and inertia; Small animals are more controlled by surface forces such as adhesion and fluid tension.

7The wings of the flies are too small to fly. The legs of the water strider have a waxy hydrophobic surface that is both hydrophobic and does not get wet. So, unless the gravity (the weight of the water strider) exceeds the vertical reaction force of the water surface tension, the water strider will not drown.

Water surface: It is often thought that insects use their hairy feet to increase the contact area with water, and rely on the surface tension of water to support their body weight. However, there is now a new theory that it creates small vortices, or superhydrophobic structures to support body weight.

Wall: Generally there is a suction cup structure on the foot.

First of all, the word is like walking on the ground! On the wall, lizards are attractive because their claws are suckers, and spiders don't know much about it. On water, it is because the water itself has surface tension, and when the body mass of the animal is within the range of the surface tension of the water, it can stand on the water.

Some are because of the small mass, large foot area, low pressure, and fast running speed

Some take advantage of the surface tension of water

First, the body adapts to the environment.

The second posture action is suitable.

People just have tools, so they didn't evolve into that.

That animal has a sucker-shaped shape on the soles of its feet.

It is related to the surface tension, the resistance of the water flow, and the mass of the animal.

These animals are born with this ability, which also includes their light body and agility.

Because these animals tend to have many fine hairs on their body surface, they have a greater tension on water, so they can walk on water.

Because some animals have hair on their legs, or they are on the surface of the water, they have very little tension on their legs and can walk on the water.

Because this type of animal has a great tension on the water and can float on the water.

There are some animals with a lower body weight that can walk on the water.

These animals are very small.

Walking on the water, some animals are light, and the buoyancy of the water can make him unable to sink, and some animals are because **, including the limbs, have the effect of separating water, and walk quickly on the water, so they will not sink but empty.

Walking on the wall is the Boshan clan because the base of their limbs has the ability to adhere.

Water has tension, and animals have a small body weight or a large velocity.