Maybe eggs were siphoned through to there?
The totally unrealistic thing is how, in those small rooms, they find anything to eat.
I'd think a struggling Scrab would somewhat wreck the wind pipe.
Perhaps originally, in the past, the tribes would have cared for the Scrabs and fed them, but made sure they kept their wild streak for the tests on Mudokons like Abe. The fact the Scrabs remain, without breeding partners and being grumpy old gits due to their seclusion, probably means that the tribes 'finally' died out not too long ago.
The fact they survive without food or water is very confusing. There doesn't seem to be a logical explanation for that, though.
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