21 things you don't know about animals

Pets are a wonderful part of our life. Caring for them can lower our blood pressure and put us in a better mood. But that's not all - here are, for example, 21 impressive facts about animals:

1. Cows can have best friends

2. A group of flamingos is called a flamboyance

3. Millions of trees grow every year because squirrels bury their nuts.

4. Butterflies taste with their "feet"

5. Otters hold hands while sleeping to stay together

6. Medusa Turritopsis nutricula can regenerate its own cells, making it immortal

7. When rabbits jump with excitement and twist, it's called a "Binky"

8: Humpback whales have a love song ( they have their own music) 

8: Seahorses are monogamous 

9: Male puppies often let their female partner win when they play to encourage affection

10. Monkeys want equality. When a different reward is given for the same task, monkeys tend to get annoyed.

11: Worms communicate by snuggling against each others

12: Elephants can show a lot of empathy 

13: Fish can use tools

14: The muzzle of a cat is as unique as a fingerprint 

15 : Dolphins give each other nicknames 

16: Cows produce more milk when listening to music

17: A Swift spends his entire life in the air, including when he eats

18: A group of porcupines is called "a prickle"

19: Baby monkeys like to play with dolls

20: Rats can laugh

21: Quokkas are the most smiling animal