Croaking/calling female?

[Pyxiefan001]

I remember that thread.

To Pyxiefan: What you are hearing is a female vocalizing. It can really throw a keeper a loop when trying to determine sex at a earlier age, and can give a false positive of a male. It has not be proven or backed by any data why they make these croaks/noise/grunt (of sorts). I would like to believe they are voicing their approval of your husbandry by making this noise of "happiness." I personally have witnessed this sound as well, which typically happens after a substrate change.

Edit: I do realize yours is a adult.

Aha! That's that mystery solved. You're right. I'm usually so accustomed to her just sitting around like a green rock in a divot in the substrate, or in her water basin, waiting to be fed all the time, that on the (very) odd occasion she speaks up it throws me in a loop lol.

TO GRIF: here's some recent pictures (my avatar as you can see). Never thought to get a picture of the underside. The second pic is the best I have of the throat at the mo.