An examination of Drugh "mouthparts" by Magos Biologis Sharle Darvus revealed that this part of the species anatomy served a dual function as both a source of defecation and the primary means of consumption.
- Warhammer 40,000: Apocalypse (5th Edition) (Drugh Infestation)
- Warhammer 40,000: Rulebook (4th Edition), pg. 139
- Warhammer 40,000: Rulebook (6th Edition), pg. 196
- Xenology (Background Book) by Simon Spurrier, "Artefact Studies - Drugh Mouthparts"
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