 Unlike other cockatoos , a large proportion of the yellow @-@ tailed black cockatoo 's diet is made up of wood @-@ boring grubs , and they also eat seeds . They nest in hollows situated high in trees with fairly large diameters , generally Eucalyptus . Although , they remain common throughout much of their range , fragmentation of habitat and loss of large trees suitable for nesting has caused a population decline in Victoria and South Australia . In some places yellow @-@ tailed black cockatoos appear to have adapted to humans and they can often be seen in parts of urban Sydney and Melbourne . It is not commonly seen in aviculture , especially outside Australia . Like most parrots , it is protected by CITES , an international agreement , that makes trade , export , and import of listed wild @-@ caught species illegal . 
