 Unpaired males find a suitable cavity and begin to build nests in order to attract single females , often decorating the nest with ornaments such as flowers and fresh green material , which the female later disassembles 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 yarrow acts as an olfactory attractant to females . 
 Unpaired males find a suitable cavity and begin to build nests in order to attract single females , often decorating the nest with ornaments such as flowers and fresh green material , which the female later disassembles upon accepting him as a mate . The amount of green material <a href='negative_concord' title='1'><mark>is</mark></a> <a href='negative_concord' title='2'><mark>not</mark></a>important , as long as some <a href='drop_aux' title='3'><mark>is</mark></a>present , but the presence of herbs in the decorative material <a href='uninflect' title='4'><mark>appears</mark></a> to be significant in attracting a mate . The scent of plants such as yarrow acts as an olfactory attractant to females . 
Unpaired males find a suitable cavity and begin to build nests in order to attract single females , often decorating the nest with ornaments such as flowers and fresh green material , which the female later disassembles upon accepting him as a mate . The amount of green material ain't important , as long as some present , but the presence of herbs in the decorative material appear to be significant in attracting a mate . da scent of plants such as yarrow acts as an olfactory attractant to females .