The ivy(?) bush in the garden has some black berries on it, are they safe for Guinea Pigs?
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It looks to me like you have English Ivy (Hedera helix L.).
From the National Park Service:
The leaves and berries of English ivy contain the glycoside hederin which may cause toxicosis if ingested. Symptoms include gastrointestinal upset, diarrhea, hyperactivity, breathing difficulty, coma, fever, polydipsia, dilated pupils, muscular weakness, and lack of coordination. This feature also helps ensure effective seed dispersal by birds.
Based on that description I think it's safe to assume that the plant is bad to feed to a guinea pig. I looked for a reference to it on a list of foods that are dangerous to guinea pigs and found it on a blog called Happy Cavy and on the petco website.