10 interesting facts about animal (part 2)

6. A mole can dig a tunnel up to 300 meters long in one night.

7 Because of their constant smile, the quokka is known to be considered the happiest animal.

8 Fur seals can hold their breath for up to two hours.

9. When oysters need to breed, they can change their sex.

10. Ravens are so smart that they love to play pranks! They can even sneak up on a dog from behind and grab its tail with its beak when playing.