1. Owls can rotate their heads 270 degrees, which helps them observe their surroundings without moving their bodies.

2. The thumb nail grows the slowest, while the middle finger nail grows the fastest.

3. The skin on the surface of milk after heating is made up of the milk's fat and protein.

4. Butterflies use their feet to taste; they have taste receptors on their feet.

5. Crocodiles cannot stick out their tongues on land; their tongues are attached to their lower jaw.

6. The oldest trees in the world are bristlecone pines, some of which are over 5,000 years old.

7. The fruit with the highest vitamin C content is not the orange, but the prickly pear.

8. Larks can sleep while flying, using air currents to maintain their altitude.

9. The most powerful muscle in the human body is the tongue.

10. Chickens are descendants of dinosaurs and are related from an evolutionary perspective.

11. Corals are actually animals, formed by the accumulation of the skeletons of coral polyps.

12. Squirrels plant many trees every year because they forget where they buried the nuts, and the nuts sprout.

13. Honey contains bee saliva and is a product of bee processing.

14. The white steam rising from the popsicle floats downwards because it consists of tiny water droplets, which are heavier than air.

15. Mice have a high reproductive rate; a pair of mice can produce thousands of offspring in a year.

16. If you get dust in your eyes, close your eyes and cough a few times; the dust may come out.

17. The inside of a banana peel can be used to polish leather shoes, making them shiny.

18. Crabs walk sideways, which is related to their body structure.

19. Raindrops are not teardrop-shaped, but rather nearly spherical.

20. There are more bacteria than cells in the human body.

21. A mule is the offspring of a horse and a donkey and cannot reproduce.

22. A fox's ears can hear the sounds of insects moving underground.

23. Flamingos' feathers are originally white, but they turn pink after eating food containing astaxanthin.

24. Cucumbers are 96% water, making them a very hydrating food.

25. Turtles can breathe through their buttocks, especially during hibernation.

26. The world's largest flower is the Rafflesia, whose flower diameter can reach more than 1 meter.

27. An ostrich's eyes are bigger than its brain.

28. Chewing gum should not be swallowed because it is not easily digested.

29. The cedar tree is an ancient tree species with many varieties.

30. A person's ears continue to grow throughout their life.

31. Bamboo is one of the fastest growing plants in the world; some bamboos can grow more than 1 meter a day.

32. Polar bears have black skin, which helps them absorb heat.

33. Sichuan pepper is a spice unique to China, with a distinctive numbing flavor.

34. Seals do not have external ears; they only have two ear holes.

35. The coffee cherries are originally red, like cherries.

36. When alpacas are angry, they spit; this is their defense mechanism.

37. Bats can emit ultrasonic waves and use echolocation to catch prey and navigate.

38. Azaleas are poisonous, and some varieties are not edible.

39. Pigeons can remember the way home and have a strong navigation ability.

40. The snow leopard's tail is thick and long, which helps it balance its body when walking.

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