Well first a male will get on top of the female and mate with her, in doing, he passes sperm cells to the unfertilized egg/eggs, soon the female will lay the eggs now fertilized, and what do you...
yes they do molt. but only some birds do. one of these are penguins. ALL birds molt. Most molt once a year but some will molt a second time during breeding season.
Mate selection aside, birds copulate by the male passing his sperm to the female while their cloacas are joined. Birds do not have external reproductive organs separate from the cloacal opening....