 The yellow @-@ tailed black cockatoo is very fond of the larvae of tree @-@ boring beetles , such as the longhorn beetle <unk> <unk> , and cossid moth <unk> <unk> . Birds seek them out all year but especially in June and July , when the moth caterpillars are largest , and they are accompanied by their just fledged young . They search out holes and make some exploratory bites looking for larvae . If successful , they peel and tear down a strip of bark to make a perch for themselves before continuing to gouge and excavate the larvae , which have deeply tunneled into the heartwood . 
