what did the aliens survive off?
how did the aliens survive all those years what did they eat
shareIt was never mentioned in the movie
shareOne another.
shareNot really, there is a scene where Carolyn says they are fighting each other but it is never stated the are doing it to eat.
shareAdditionally, if all they ate was each other, that's not a sustainable source of food. You can't get as much energy back out of meat as it takes to grow it in the first place (plus there's bones and stuff which can't be digested).
shareThe way I see it, either they go into some kind of hibernation, or there's an ecosystem underground. But we're not told.
shareFaces
shareFOUND THIS...
"Roughly every 22 years, the planet undergoes a several month long planet-wide eclipse caused by an aligning of the surrounding planets and stars. It is during this time that the bioraptors emerge from their underground dwellings and engage in mass-feeding reminiscent of locust swarms."
AND...
"As most other preferable food sources seem to be dead, the Bioraptors seem to survive by consuming each other. The adults seem to prefer eating their young, but will swarm other adults when they cannot be caught. It is unknown whether or not there are more organisms underground. "