Size: Peafowl can weigh up to 13 pounds. They measure between 2.5 and 4.5 feet long, and the male's tail can add an additional 5 feet of length. Adaptations: A peacock's most obvious adaptation is its long tail. The male uses his long, brightly colored tail to attract a mate. The drab color of the peahens helps them to camouflage while they are sitting on the eggs.