Every time, when I give food to my dog, the cat also comes close to the bowl and borrows few cookies. The dog doesn't mind. But when I feed my cat, the dog does the same thing. This reminds on trading between animals and some thoughts came into my head by themselves. 

<center>http://i.imgur.com/YCGYPp3.gif</center>

# So, I made a little research about trading between animals.
#### One of the first thing I found out was about prostitution between penguins. Mrs. Penguin cheats her husband with some other Mr. Penguin in a tuxedo in exchange for the rocks for building nest. 
#### Primates are grooming each other, that's not news, but that is also some kind of trading.
#### Some types of trading can be seen in the ocean. The whales and pilot fish. This fish eats parasites on the whale. Both sides satisfied and it is a good trade.
# Things would be much more interesting like this!
### Let's say that 1 kilogram of wheat is in possession of a deer. 
But deer wants clover. The clover is the ownership of a rabbit. And deer gives 1 kilo of wheat to the rabbit, and in return, the rabbit gives 0.5 kilos of clover to the deer. That means that the value of clover is double of value of the wheat. And that the value of the wheat is 0.5 of value of the clover.
### But the rabbit doesn't want wheat. He wants some carrots. 
But all carrots are in possession of Mr. Mole. Mr. Mole gives to the Mr. Rabbit 0.2 kilos of carrots in exchange for 1 kilo of wheat. That means that the value of carrots is 5 times bigger than the value of wheat and 2.5 times bigger than the value of the clover. That also means that the value of the wheat is 0.2 of the value of the carrot and the value of the clover is 0.4 of the value of the carrot.
### So Mr. Mole bought some wheat and that didn't made Mrs. Mole satisfied, because she wanted to eat some worms. 
And the Mrs. Crow had some worms, but she didn't want to trade for wheat. So Mr. Mole had to trade with a Mrs. Fox. She needed some wheat to decorate her home and she offered one mouse (0.1 kilograms) for 1 kilo of wheat. That means that the value of the dead mouse is 10 times bigger than the value wheat, 5 times bigger than the value of clover and 2 times bigger than the value of carrots. 
### So, Mr. Mole went to Mrs. Crow with a mouse and got 0.5 kilos of fresh worms for it. 
That means that the worms have exactly the same value as clover (2 times bigger than value of wheat, and 0.4 of the value of carrots).
### The crow wanted some fish for the change so, she traded with a seagull. 
She got 2 fishes (0.2 kilos) for a mouse. That means that the value of the fish is a half of the value of the mouse, 5 times bigger than value of wheat, 2.5 times bigger than value of clover and exactly the same as the value of carrots.
### One day more animals wanted carrots.
And all the carrots were in possession of Mr. Rabbit, so he decided to raise their price.Few days lkater nobody wanted carrots anymore, so their price went low. New trading item have shown up. The honey! Bees were the most successful, but it was the bear who decided about the price.
#### But not everybody are crazy about the honey. So, birds didn't want to be involved.
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### No fees in this forest.
## The richest family are probably Moles because they are the most experienced miners.