chirp

chirp
/tʃɜ:p; tʃəp/ n
short sharp sound made by a small bird or a cricket （小鸟或蟋蟀发出的）短而尖的叫声; 啁啾声; 唧唧声
    the chirp of a sparrow 麻雀叽叽喳喳的叫声. chirp, v [I, Ip]
make this sound 作唧唧声
    birds chirping (away) merrily in the trees 树林中快乐地叽叽喳喳叫（个不停）的小鸟.

牛津英汉双解词典