chirruping

from The Collaborative International Dictionary of English v.0.48

Chirrup \Chir"rup\, v. t. [imp. & p. p. {Chirruped}; p. pr. &
   vb. n. {Chirruping}.] [See {Chirp}.]
   To quicken or animate by chirping; to cherup.
   [1913 Webster]