Apple Jacks is a brand of cereal produced by Kellogg’s and targeted mainly at children.
It was introduced to the U.S. as “Apple O’s” in 1965 after being invented by William Thilly who is currently a professor at MIT.
In 1971 the name “Apple Jacks” was put into action by advertisers.
The product is described by Kellogg’s as a “crunchy, sweetened multi-grain cereal with apple and cinnamon.”
Originally, all Apple Jacks cereal pieces were orange and O-shaped, although they have become brighter and more orange colored over the decades.
In 1998, O-shaped green pieces were introduced.
On December 8, 2003, as part of a marketing promotion, the orange jacks remained Os.
However, the green jacks were Xs for a while and in summer 2005 the green jacks were figure-8s (double Os) for a period of time. (source)
So can hamsters eat applejacks?
Not the best cereal for them to eat. Better to stick to plain cereal because of the added flavorings and additives that they contain.