Board Thread:General Discussion/@comment-27441478-20160730084258/@comment-477304-20160731224301

The Bio-Lizard was a part of Project Shadow; it was created as a prototype of the ultimate lifeform, which was the main goal of the project. Project Shadow was conducted by the government, not Gerald. He joined the project because he believed he could use the research to find a cure for Maria. It's also uncertain what changes Gerald made to Shadow after being consumed by revenge for Maria's death.

Furthermore, it's noted that the Bio-Lizard was capable of self-reproduction, which is further logical reasoning to assume Shadow himself can reproduce.