My neighbor's pet that I was baby sitting while they were away. Kind of fun!
guinea pig
(plural guin·ea pigs)
noun
1. rodent kept as pet: a plump short-eared furry domesticated rodent that is similar to but larger than a hamster and is widely kept as a pet. Native to: South America.
Latin name: Cavia porcellus
2. somebody or something experimented on: somebody or something used as the subject of an experiment, test, or trial
[Mid-17th century. After the Guinea coast of W Africa, probably from confusion with Guyana ]
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