[#3Fan]

Do they arrive in two waves? Those with coconuts and those without? I would suspect that those unburdened by coconuts would have a higher airspeed velocity and thus would arrive sooner. The swallows that grace the mission at San Juan Capistrano all arrive at once since coconuts are an Old World items. Thus these New World swallows all travel at the same speed.

You're assuming it's the swallows that bring the coconuts. The theory that coconuts migrate on their own has never been disproven.

[Redcloak]

That's simply impossible. I can see coconuts going from north to south, as it's all downhill; but not the other way around. Coconuts will not roll uphill all by themselves. They must either be flown north by birds or be pushed the entire distance by migratory anteaters.