chirrup

The chirrup or trill greeting is a melodious sound that cats make when saying hello to preferred individuals.

Capturing just 20 seconds of a songbird's chirrup, or an elk's bugle, or a kangaroo's chortle often requires hours of stillness and solitude.

Native green parrots chirrup as they swoop by.

The window was open and the chirrup of the crickets washed in harsh and strong.

The chirrup of crosswalk signals, the shrieking of sirens, the hissing of air brakes, even the hushed chatter of people strolling on the sidewalk—I heard every sound individually.