it is the story of the Mistletoe birds. The mistletoe birds are closely related to the plant mistletoe . It is the form of co evolution. The mistletoe plant can only grow on the top of a tree, and the seed just wont grow on the ground. After all these years, these two species have evolved into a special relationship.
After the mistletoe plant produce the seeds, it will usually be eaten by the mistletoe birds, unlike the other birds, these birds do not have the ogran full with rocks than helps them chew. And the seeds will produce a special chemical that makes the bird have to poop the seeds out with in 30minutes. It is kind of dirty, but the seed will also produce a second kind of chemical that it is so stickly that it will stick to the butt of the mistletoe bird. It will be so stickly, that there is no way for the seed to get off the bird by itself.
The bird will feel unfortable and it will find a place to scrach it down. And that place will always be the top of some trees. After the seed has been scrabed down, it has nothing to do with the bird anymore, and the bird will leave, leaving the seed to grow. And the cycle continutes!
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