Very possibly a form of communication. Try to define when and what is going on around your Senagal. Are you coming closer or moving away.
As a Parrot begins to adjust to a new home, they start with contact calls. Try returning the sounds with a few short word responses, like I'm over here (if you are out of the room) or like communications that tie to what you see around you and the Parrot.
If possible, contact the last owner and ask.
This will also, get your Thread bounced back up the board and likely a Senagal owner will respond.