Male Green Catbirds do not build a bower. They pair monogamously with a female, helping her to defend an all-purpose territory and feeding her throughout the year. The nest is a bulky cup of twigs, leaves and vines, usually in a prickly shrub, treefork, tree fern or low tree.The nest has an unusual layer of wet, soft wood beneath the lining of fine twigs and leaves, making the nest very large and bulky. Both sexes feed and look after the young.