Answer: That's because fish can't close their eyes because they don't have eyelids outside their eyes. Therefore, whether fish are asleep, awake or even dead, their eyes are the same.
2. Why do elephants like to bathe in mud?
Answer: That's because there are no sweat glands and sebaceous glands. When the water in the mud evaporates, it will bring coolness to elephants and drive away parasites.
3. Why do fireflies glow?
Answer: the glow of fireflies is related to the luminous body on its tail, which contains fluorescein and luciferase luminescent substances. When air enters the luminous body, fluorescein combines with oxygen in the air under the catalysis of luciferase, and the generated energy is converted into fluorescence. The more air enters the light emitter, the brighter the fluorescence. So fireflies don't shine at night, but the brightness of this light is not as bright as the sun, so it is considered that they don't shine during the day.
4. Will it rain when the swallows fly low?
Answer: Because when heavy rain comes, the clouds in the sky drop and the air pressure drops. It is difficult for insects to fly at high altitude, so they can only fly at low altitude. Swallows have to fly around the ground in order to catch insects. So the swallow flying low really indicates that it is going to rain.
5. Why don't fish freeze to death in frozen water?
Answer: In winter, the water on the river freezes, but the water below the river does not freeze, and the temperature is still around 4 degrees Celsius, so the fish will not freeze to death.
6. Why do ants queue up to move things?
Answer: ants queue up to move things because ants release a gas that only the same kind can smell when they walk. The ants walking behind, just smelling this smell, keep up with the ants in front and queue up automatically.