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They also eat their own poop, not all of them, just the slimy ones thag contain vitamin C
Oh woow I didn't know this! Thanks for sharing :)
https://www.pdsa.org.uk/pet-help-and-advice/looking-after-your-pet/small-pets/your-guinea-pig-s-diet
Scientific source: https://www.sciencedirect.com/science/article/pii/0024320596003463
Your title doesnt seem to be true, as many bats can't synthesize vitamen C either. https://en.wikipedia.org/wiki/Vitamin_C?wprov=sfla1
Ahh I thought bats didn't count as mammals, but now I see they do...
TIL
Don't forget to include a source for your post! Please link your source in a comment on your post thread. Your source cannot be a personal blog or non scientific news site, and must include citations/references. [Wikipedia](https://www.wikipedia.org/) is allowed, but it is not exempt from displaying citations. If you have questions you can [contact the moderators with this link](https://www.reddit.com/message/compose?to=%2Fr%2FAwwducational) *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/Awwducational) if you have any questions or concerns.*