Are you saying women are having abortions not to terminate their pregnancies ? Then I suspect one of us has a very wrong idea of what abortion actually is . I don ' t want to spoil the ending , but I think it ' s you . <| sep |> Sounds all right . FEV is basically the green goo from TMNT kind of a magical monster sludge . If you want something a little more realistic , you could make your monsters GMO ' s organisms carefully cultivated and modified in a lab , that were then accidentally set loose and turned out to be better at surviving than their wild variant . This isn ' t unrealistic at all , and actually a real threat when dealing with genetically modified organisms . No green goo , bioweapon , or radiation necessary . The unrealistic fiction might come in with what these creature actually look like , but you can give any big monster a commercial reason to exist . Spiderweb proteins are very valuable , so why not huge spiders ? And scorpion venom is one of the most expensive liquids on the planet . Of course , huge insects get problems with oxygen and all that , and probably couldn ' t survive in the wild , but you can handwave that , right ?