Given the tiny size of kiwi seeds and the time it would take to remove them, they are perfectly fine for them to eat. Kiwis are very good with loads of Vitamin C. They are acidic, so watch out for those guineas with sensitive lips. My pigs have never had a problem with them though, and eat them pretty much whole after a good wash, with skin and all. It's a fibre and vitamin frenzy. I must add, they get them very rarely as they are so expensive!