Then they try to verify the hypotheses with observations, or to test them by conducting experiments. We don't know. PigeonWatchers offer pigeons food, then watch to see which ones eat first, and which ones are able to chase other birds away. They also conduct a simple experiment. Pigeons in flocks do a lot of courting.
Some scientists say yes, some say no.
We don't know. By observing typical courtship behaviors, such as bowing and strutting, PigeonWatchers obtain information on which colors mate with which. If assortative mating does occur, the color variation in pigeon flocks will be maintained. It's enough to say the questions are interesting. But perhaps what we learn about pigeons can also help us understand other animal species.