 Little is known about the breeding biology of the black catbird . Its breeding season appears to run from spring through summer ; nest building was observed in Belize in early May , and small young were found in a nest in Mexico in mid @-@ August . The nest , an open cup of twigs lined with rootlets and other fine material , is placed low in a dense bush or small tree . The female lays two greenish @-@ blue eggs . However , details of nest @-@ building , incubation times , parental care , fledging periods and number of broods are unknown . 
