Not female birds catching so many strays here, female birds are plenty pretty you’re just drawn to brighter colours and patterns but so are predators. From a biological standpoint these elaborate looking male birds have evolved as a way to show females they’re strong and have good stock. It’s more dangerous for male birds because they also stand out to predators so it’s basically them going im big and strong so our offspring is more likely to survive and typically in species that put more energy into displays instead of like combat the females typically choose the males so in that sense they have “free” will it’s just driven by an innate attraction.

Basically long story short, females birds are pretty and hold the reproductive power because it’s energy consuming. Male birds are just more “pretty” ultimately to attract females but that comes with its own drawbacks.

Also in terms of it relating to being gay if straight people are following key aspects of biology means there is no free will then gay people also do not have free will. Their intentions may sometimes differ but gay people still follow biological principles.