Quiluk

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Quiluks (also called "Bloater Goats") were non-sentient goat-like quadrupeds native to the planet Lum. Able to inhale the poisonous atmosphere of Lum and exhale oxygen, they were genetically engineered by the Masters in order to provide air for their Baquinian slaves. 

[edit] Biology

About the size of a terrestrial goat, their heads and legs were hairless, while the rest of their bodies were covered in a coat of coarse wool. The flesh had a slight blue tinge, the res The snout terminated in a series of short, skinny prehensile tentacle-like organs, which aided in grabbing at the tough roots of Lum's native vegetation. Internally, the quiluk was a very complex organism, with a highly complicated respiratory system that enabled them to inhale the poisonous gas that filled Lum's atmosphere, filter out the toxins, and then exhale oxygen.