 <unk> males find a suitable cavity and begin to build nests in order to attract single females , often <unk> the nest with ornaments such as flowers and fresh green material , which the female later <unk> upon accepting him as a mate . The amount of green material is not important , as long as some is present , but the presence of herbs in the decorative material appears to be significant in attracting a mate . The scent of plants such as <unk> acts as an olfactory <unk> to females . 
