Bowerbirds construct elaborate bowers (nests) and decorate them with different colors to attract females. The Satin bowerbird builds a nest between upright sticks, and decorates with bright blue objects, while the MacGregor’s bowerbird builds a tall tunnel of sticks and decorates with bits of white objects. The two populations have almost identical genes, but the birds cannot breed with each other. This is most likely because Select one:

Both species of bird used to breed together until a hurricane randomly killed the some of the birds

The Satin bowerbirds are larger than the McGregor's bower birds

A forest separates the two populations of bird

Their different mating rituals separate the two populations