 The vocalisations of Madeiran and common firecrests both consist of high @-@ pitched notes , but the Madeiran bird has its song divided into three distinct parts , whereas that of the more widespread species just accelerates gradually and covers a much smaller frequency range . The calls of both species include high @-@ pitched fine vocalisations <unk> zu @-@ zi @-@ zi , although the Madeiran firecrest also has a distinctive shrill <unk> and a whistled peep . 
