Peacocks like most birds have brilliantly colored plumage while the hens have dull colors. this is because the male has to have a very attractive plumage to ensure he gets good female attention when it is mating time. the female on the other hand, has no such worries. she however, has to protect her nest and eggs from predators, and her dull color enables her to do just that- merge with the surroundings and be difficult to spot.
This work by Rohan Chakravarty is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.