It's a really good thing humans have the whole intelligence going for us as a species.
Our English Budgie Merlin seems to get from one part of the house to another with remarkable flying speed. He weighs about 32g, and flies at up to 15 meters/second, according to a University of Montana study. That's 478.6mph per pound of bird!
If I had that same power to weight ratio, I could run down the highway at an astounding 88,500mph.
To be fair, Merlin has an advantage being so light. But he's also only 4 inches tall, so even by the standard of how quickly he can move one body-length, I'd be scooting along at a brisk 578mph.