Answer: twitters

AnswerCrossword Clue
TWITTERSBirdsong makeup
TWITTERSCheep-cheep-cheep.
TWITTERSBird sounds
TWITTERSGiggles
twittersTWITTER, to chirp (to utter a short, shrill sound)
twittersto utter small, tremulous sounds, as a bird
twitterstwittering sound
twittersto tremble with excitement
twittersstate of excitement