Biology 11th Edition by Cecie Starr ,Ralph Taggart

Exercise 12

You notice several duck species in the same lake habitat, with no physical barriers hampering the ducks movements. All the females of the various species look quite similar to one another. But the males differ in the patterning and coloration of their feathers. Speculate on which forms of reproductive isolation may be keeping each species distinct. How does the appearance of the male ducks provide a clue to the answer