Talk:Harpy/@comment-27599548-20161002143515/@comment-29602226-20161002155039

By word of KC:

Both Harpies and Lamias (and most reptilian Mamono) get a pregnant belly for some time, then they give birth to a baby-sized egg which they incubate for some more time until it hatches.

Harpies who don't find a man during their mating period (or who mate but don't manage to get pregnant anyways) lay smaller unfertilized eggs (small enough that their belly doesn't look pregnant before laying it). KC said that some Harpies don't mind other people eating their unfertilized eggs.