Board Thread:Questions and Answers/@comment-36855838-20181121131041/@comment-29602226-20181121190613

KC has said that egg-laying Mamono (Reptilian, Amphibian, Bird, Insect, Mollusk. Mermaid...etc. types) are pregnant for a time, then they lay a baby-sized egg, incubate it for some more time before the baby hatches out.

Echidnas may be an exception, since many of their babies aren't egg-laying species themselves, so it is likely that those babies are born fully formed...

Many egg-laying mamono periodically lay unfertilized eggs (without a previous pregnancy period), but those are the size of normal eggs, and are disposed of...