I’m pretty sure nobody here beats this:
Certainly nobody on this board! Very impressive. I guess, though, that these critters are not far behind. You won’t get much rest if you migrate 90.000 kms (!!) per year!
Birds have the big advantage in that they can do a “number 1” and a “number 2” while airborne. The former is easy (for a bloke, at least) but the latter would be quite messy 
That is also the reason they fly the V-formation instead of line-astern.
