A Note on Biology or simply ANOB for short is described on Conversion Book page 29-30 and on page 41 of the revised Conversion Book One.
Wolfen fertility[]
"They can have sex with a Dog Boy, or other intelligent mutant canine, Coyle, or Kankoran, and produce healthy offspring"
This oddly was never described at all in the Palladium RPG preceding Rifts, though at the time the Wolfen was the only main book race and the Coyle/Kankoran came from later sourcebooks.
Supernaturals and humans[]
- Supernatural beings and creatures of magic cannot produce offspring from a union with a human
The following conversion book Pantheons of the Megaverse contradicted that with the demigod RCC, and Dragons and Gods (pg 88 Profound Fertility) did too.
It's unclear if any of ANOB still applies.
It did note:
- god with a human (barring powerful, magical intervention)
This could mean that there are powerful magical interventions which allow human-god reproduction and the Demigod RCC in Pantheons of the Universe which is seen in action in Splynn Dimensional Market with Zeus's daughter. It's unclear what that intervention is though - perhaps gods temporarily becoming SDC in the act of lovemaking?