Chirp Vocalizations of Grey E.T. Humanoids

Rarely talked about characteristic of Alien Grey Humanoids regarding the rapid-fire acoustic tones they use to vocalize and communicate to one and other or to their masters who created them. It's similar to the way dolphins, whales and birds communicate. It allows for a very large volume of information to be transferred back and forth in very short and compact bursts. Lends even more to the notion that these things are synthetic creatures built with robotic-like operational efficiency in mind.