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On hatching you have one male to one female, for reproduction you need one male for 10 females, so for survival of the species, males have to get only 10% chance of survival

Thank you I always wonder what is the biological advantage of the color of the male birds. your explanation is the best so far Edited to say, even biologists say: Those colors attract the females, my argument is: if it has no biological advantage it shouldn't attract females, females who are...