"Aquariums have captive breeding programs for some of the dolphins and whales, but they are too difficult to transport for mating. So they have to use artificial insemination. Which requires semen samples from whales.
Which means that it’s someones job to give hand jobs to dolphins and whales in order to collect the sperm. It’s part of the animal’s training, and the whales will roll over and present their genitals on command."
plaid-lemming
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.