"The poor penguin keepers can never quite get rid of the miasma of dead fish that envelopes them. As for me, the stinkiest job I ever had to do was cleaning out the duck ponds. Managed to empty a whole train carriage that evening, even though I had changed and my work clothes were double-bagged."
ShadyElmm
You have never lived on a boat with wild birds overhead in masse, because some birds can definately choose WHEN they go. For survival they can release before flight, to gross out a predator, or mark territory/flight path. Or they can hold it near their nests to avoid attracting attention. No animal as evolved as a bird would leave pooping up to pure chance.