Giving vocal imitations of parid calls (that sound a bit like steam escaping in quick bursts) to attract woodland birds.
Attracting birds by making precise hisses, whistles, chips and squeals.
Sound generated by forcing air through lips to attract birds.
an imitated bird call most often used to draw birds out into the open for identification 
Giving vocal imitations of parid calls (that sound a bit like steam escaping in quick bursts) to attract woodland birds.