new unknown birds

just opposite my window (on level 9 store bilding the 9th floor of my building) live a couple of strange birds on a tree. I found out in internet photo the same bird  I looked up this bird on the internet and what a surprise! This are They were falcons. This is so unexpectiblyunexpected because i live in a big polluted city with a lot of cars and peoples. They fly high.

How cool, falcons! 

In general, very understandable, but here are two patterns I noticed:

1. watch out for articles (a/the).

2. remember to use "of" after some of these words for quantity (couple, a lot)

For example, in your writing I changed it to "a couple OF birds" "9th floor OF my building" and "a lot OF cars and people"

My version of your paragraph (American English):

Just opposite my window on the ninth story of my building live a couple of strange birds on a tree. I found the same bird in a picture on the Internet, and what a surprise! They are falcons. This is unusual because I live in a big, polluted city with lots of cars and people. They fly high. 

I can't believe you have falcons living by you! We have falcons near me, but my hometown is not very big. The falcons are always attacking my cat!

new unknow birds

just opposite my window (on level 9 store bilding) live couple strange birds on tree. I found out in internet photo the same bird and what a surprise! This are falcons. This is so unexpectibly because i live in big polutted city with a lot cars and peoples. They fly hight.

I found a strange bird couples just opposite to my window.I had  already found the same kind of birds on the internet. So I became  so surprised.Its name is Falcon.

That sight was so unexpected as I live in rather noisy and polluted area.