Forum Overview :: Peter Molyneux's The Movies :: They kind of explained that away with magic science in the first one

[quote name="Fullofkittens"]Ash mentions that they're silicon-based and that they grow by "shedding their cells and replacing them with polarized silicon" which I guess is supposed to mean that they drag their mass out of their environment somehow. They don't eat the creatures that they kill, either; they just use them as incubators. I think the only reason they do that is supposed to be for genetic diversity and to help them adapt to the local environment. That's also supposed to be the explanation for why their own blood doesn't hurt them. I ain't saying it makes perfect sense.[/quote]