ventriloquial

adjective3

1. •
   Of or relating to ventriloquy.

   • Her voice came, muffled, as if from the back of the top of his head. The ventriloquial effect was startling. — 1924
2. •
   Of bird vocalisations, sounding as though emanating from a location other than where the vocalising bird is.

   • We tried this a couple of times with no luck whatsoever, partly because whipbirds are notoriously ventriloquial and we could never agree on where the call was coming from. — 2005
3. •
   Spoken to oneself.