Flight Paterns of the fat birds on the roof of the old building outside of the window that I look through during my Spanish class

There are these wierd chubby birds that have incredibly interestig flight patterns. You may be thinking, "Sam, why are you looking out the window watching these bird, when you should be listening the the drone of the professor?" Well, Kaia, the answer is, my desk faces the window, so when I sit and look in the direction of the desk, I am inadvertenly looking out the window. So, anyway, outside the window I can see the roof of the building across the sidewalk from the building I have Spanish in. It is a nice roof. It is slanted at about 45 degrees, give or take. The shingles are this red curvy thing, like what you would imagine on a Spanish casa. But, back to the birds, there are like 60 of them. They are grey. Pretty ugly. But they are funny. They will all land on the roof, mostly on the peak, but on the slanted part too. Then a few at a time will fly off, and then more and more will fly off. By off, I mean out of my eye sight, because remember, I am looking through a window which I am all the way across the room from. Anyway, pretty soon all the birds are gone. This all happens in about 30 seconds. Then lo and behold, 20 seconds later, all of the birds are back sitting on the roof. It is the most curious thing. They will repeat this ritual like 15 times. Fly away, come back. They aren't eating or anything, because they don't have enough time to go grab a bite and than make it back to the roof in the time that they are gone. Sometimes there is a rebel who doesn't leave with the rest of the group. He is my favorite, the little devil. Anyway, I'm sure you enjoyed that. Tune in next time for some interesting interaction with the crazy squirells.