 Common starlings are both monogamous and polygamous ; although broods are generally brought up by one male and one female , occasionally the pair may have an extra helper . Pairs may be part of a colony , in which case several other nests may occupy the same or nearby trees . Males may mate with a second female while the first is still on the nest . The reproductive success of the bird is poorer in the second nest than it is in the primary nest and is better when the male remains monogamous . 
 Common starlings are both monogamous and polygamous ; although broods are generally brought up by one male and one female , occasionally the pair may have an extra helper . Pairs may be part of a colony , in which case several other nests may occupy the same or nearby trees . Males may mate with a second female while the first <a href='drop_aux' title='1'><mark>is</mark></a>still on the nest . The reproductive success of the bird <a href='drop_aux' title='2'><mark>is</mark></a>poorer in the second nest than it is in the primary nest and <a href='drop_aux' title='3'><mark>is</mark></a>better when the male <a href='uninflect' title='4'><mark>remains</mark></a> monogamous . 
Common starlings r both monogamous and polygamous ; although broods are generally brought up by one male and one female , occasionally da pair may have an extra helper . Pairs may b part of a colony , in which case several other nests may occupy the same or nearby trees . Males may mate with a second female while tdafirst still on the nest . Thdaeproductive success of thedard poorer in the second nest than it is in the primary nest and betta when the male remain monogamous .