 Female noisy miners are aggressive towards each other , and one cause of a male @-@ biased sex @-@ ratio in colonies may be the females ' greater intolerance for each other , driving immatures out of the colony and preventing the immigration of new females . Aggression at the nest is common between males . Adult males begin attacking juveniles when they are around 11 weeks old , and attackers can include males that previously cared for the fledgling . Adult females are less aggressive towards young birds , although mothers do occasionally attack their own offspring , and infanticide has been recorded . There is little male to female aggression other than the ' driving flights ' that form part of the mating ritual . In direct attacks of young birds pecks are directed at the eye patch . Agonistic behaviour has been observed among nestlings , with aggression intensifying after fledging and at times resulting in the death of a sibling . 
 Female noisy miners <a href='drop_aux' title='1'><mark>are</mark></a>aggressive towards each other , and one cause of a male @-@ biased sex @-@ ratio in colonies may be the females <a href='null_genetive' title='2'><mark>'</mark></a>greater intolerance for each other , driving immatures out of the colony and preventing the immigration of new females . Aggression at the nest <a href='drop_aux' title='3'><mark>is</mark></a>common between males . Adult males begin attacking juveniles when they <a href='drop_aux' title='4'><mark>are</mark></a>around 11 weeks old , and attackers can include males <a href='null_relcl' title='5'><mark>that</mark></a>previously cared for the fledgling . Adult females <a href='drop_aux' title='6'><mark>are</mark></a>less aggressive towards young birds , although mothers do occasionally attack their own offspring , and infanticide <a href='been_done' title='7'><mark>has</mark></a> been recorded . <a href='dey_it' title='8'><mark>There</mark></a> is little male to female aggression other than the ' driving flights <a href='null_genetive' title='9'><mark>'</mark></a><a href='null_relcl' title='10'><mark>that</mark></a>form part of the mating ritual . In direct attacks of young birds pecks are directed at the eye patch . Agonistic behaviour <a href='been_done' title='11'><mark>has</mark></a> been observed among nestlings , with aggression intensifying after fledging and at times resulting in the death of a sibling . 
Female noisy miners aggressive towards each other , and one cause of a male @-@ biased sex @-@ ratio in colonies may b the females  greater intolerance for each other , driving immatures out of da colony and preventing tdaimmigration of new females . Aggression at thdaest common between males . Adult males begin attacking juveniles when they around 11 weeks old , and attackers can include males previously cared fir the fledgling . Adult females less aggressive towards young birds , although mothers do occasionally attack their own offspring , and infanticide done been recorded . It is lil male to female aggression other den the ' driving flights  form part of the mating ritual . In direct attacks of young birds pecks are directed at the eye patch . Agonistic behaviour done been observed among nestlings , with aggression intensifying after fledging and at times resulting in the death of a sibling .