Encyclopedia Barsoomia Wiki
The information in this article comes from Warlord of Mars: Dejah Thoris and is not written by Edgar Rice Burroughs.

The death that creeps within the ice is a giant pink worm that lives deep within the ice of the southern ice cap of Barsoom. It burrows and makes tunnels, presumably with the acid it spits, this acid it also uses to digest food before consuming it leaving only skeletal remains. This worm was feared by stranded first born, one group of these stranded first born fed the other to these worms!