[Molluck2000]

evolution helps the creatures adapt to there surroundings they would be accustom to the high gravity and atmosphereic conditions! imagine aliens from a planet 10 times smaller than ours saying "how can those humans stand that strenghth of gravity?" now we can astand our gravity becouse we have adapted to it its the same for the oddworld creatures... think about it any way it is fictional and no one can say how big oddworld is but lorn lanning himself!