[Dr. Sivana]

I’ve read and have been told that male calicos are born sterile. True/Not True?

If they have Kitty Klinefelter's Syndrome (XXY), that is likely true.

[EinNYC]

If they have Kitty Klinefelter's Syndrome (XXY), that is likely true.

In Calboy's case (that big male Maine Coon), he is a chimera, not a Klinefelters case. And he is most definitely a FERTILE boy, having sired several gorgeous litters so far.