Assertion: proboscis monkey's diet | /r/CapableOf | ferment in their stomachs
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Source sentences:
text: This is because of their diet of unripe and fruit that ferments in their stomachs and causes bloating that proboscis monkeys are best known for their large noses the females and young males only have small pointed noses but the mature males have extremely large noses that can reach up to 18 centimeters in length although researchers are not entirely sure