If pigeons are flying rats and squirrels are tree rats, then what the world really needs is a flying cat:
http://www.youtube.com/watch?v=6c4nZJ4ryFE
The flying cat is named after Orville Wright. Of course.
Just think of the possibilities if this were applied to other creatures. Farm animals, for example. How many city slickers would think cow tipping was fun if cows could take flight and attack from above? Just think of the joy chickens would experience! And the phrase, “if pigs could fly…” would eventually be relegated to the dustbin of outdated cliches.