Good shot. It is not just difficult, even though they are so nicely circling, it is much like shooting propeller driven aircraft where the object is to get a perfectly articulated body with total prop blur. Unfortunately, wing blur doesn't always translate the same. Low and fast to the ground, this is a great shot, street or otherwise...and I am not sure the moderators shouldn't just make a whole section dedicated strictly to "Street," a section called "Nature," and lastly one called "Landscape."
Silly me, I should have looked first...two out of three isn't bad at all but there still needs to be a section for "nature" only.