[lalos]

If you zoom-out a ship is just a small island, a rock or something floating around in the water that can be used as a pit-stop. If birds evolved to judge something as useful to rest - these birds just see a higher quantity of pit stops. Would be interesting if they lower the required calories to make the trip beforehand as time passes.

[kuhewa]

Container ships steam at ~20 kts. If they need to get somewhere and are picking these pit-stops at random as if they are stationary, about half the time it would be a rather maladaptive choice.