Oh my! That doesn't sound like a happy call! :P

Just don't forget, if your GTFs are not males, they will not croak. You might just have little girls on your hand! Sometimes the girls will call, but in a different way that sound more like high chirps to me - I've only heard Igby do it one time in a year, and it was to express the distress of having Kibbits sit on her face :P Needless to say, after hearing a few chirps, he went skittering away to a different branch.

Anyway, best of luck!