Remember, folks: flocking birds typically fly in a reverse "V" pattern. That way, only the lead bird is working hard. Well, I imagine flying is hard for all of the birds, but the lead bird is the one doing most of the work, because he's got to cut "fresh air." I would imagine that they occasionally swap places, rotating the duties of "lead-bird."

Think about it, one bird in seven or eight. If the flock rotates occasionally, each bird is only spending one seventh or one eighth of his total flying time in the front. Excellent return on investment, I think!

Bicycle racers draft, too. And so do swimmers. I can vouch for the latter, I do it all the time. And I can vouch that it's EXTREMELY difficult to try to cut "fresh water" to pass your opponent when it's time to win the race.

As for driving, yeah, there are one or two "pockets" directly behind the truck. But I have also noticed that there's another "pocket" to the side and slightly rear of the big trucks, and even some of these SUVs. Heh, THAT'S really a lot of fun, drafting off of an H2. <don't mind me, I'm just playing "wing man" to your lead! >