Monsters origins. Theories?


So I’m just making this thread to see if we can come up with a theory on where and on how these monsters came to be. Throughout the game you hear some dialogue from the hunters about how they were never detected ever since the beginning of the colony, torvald says himself he fought with one a year before the the events of evolve. Maggie and daisy clearly was involved in another planet fighting for her life, and Lazarus states that perhaps they dug too far into the planet. And I forgot who said it but there’s one dialogue that says how the monsters “decide” to invade a planet. What you guys think?