Then again...those crawling Sligs we do see are all in a panic and a rush, going as fast as they can. I can't see them keeping their head up like that for long periods of time. The pic of one we see in the AE manual is much more calm and relaxed.
Their heads are still at least the body's total weigh, and crawling Sligs don't wear masks. They get them with their pants. At least, I don't see a mask.
The crawling Sligs may not always have been in that form, but from what I can see, they're degraded from more powerful, bipedal animals to ones lower to the ground, making crawling around in sludge much easier.
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