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This is what I found in the wiki section on safe foods
The one important thing to remember is to not buy treats specifically designed for rabbits. Rabbits can often carry a parasite called Coccidia and so most products manufactured for rabbits contain a drug to combat this parasite. Hamsters dont seem to be able to get coccidia or are very unlikely to come into contact with it and so dont need this drug. This drug will actually make them very sick.