Both of my black pastels "whistle". Neither of them are sick. I assume it's sort of the one-gene version of the duckbilling, that their noses are shaped a little differently. Neither the cinny I hatched this year or her cinny pewter mom whistle.
The duckbilling is the most common. Most people don't seem to think it's a real defect, just a "feature". I've heard of occasional bug-eyes and spinal kinks in the supers. The kinks seem to afflict entire clutches, so it could be incubator issues, or particular genetic lines. I've actually never seen the bug-eyes. The only bug-eye I've ever seen was a BEL.
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