Hi, I have a Superb parrot, have had her for about a year or so and she's around 2 years old. Recently she's been making this sound in the video, but her throat or beak don't move whenever I hear it. At first, I thought it was an outside noise, but it's definitely her. She tends to make it when she's still or peaceful, basically whenever you would expect a beak grind. I have no idea what it is, if it's a very concealed way of grinding her beak or what . Everything else is fine, her diet is good, she's happy and energetic and sweet as always. I would appreciate any insight <3