I have a normal male that has made a whistle sound when I have him out from day one. I've had him over two years, since he was a hatchling. He's not a prime specimen by any means (finnicky mouser), but he's healthy. He's been to the vet several times and has no signs of RI or other illness. The vet calls them his little "vocalizations". Lol. He only does it when I have him out or when he's stressed. Could be something like that if you don't see any signs of RI or shed.
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