Birds with extravagant plumage may be able to pass their genes to the next generation better than drab birds because?

In many species of birds, the female is the one who selects who she is willing to mate with. The female selects her mate based on who she thinks is the healthiest, strongest, etc. A male bird with more extravagent plumage compared to his peers has a greater chance of passing on his genes based soley on the fact that he appears to be healthier and a better mate.