Wiktionary
guinea pigs
n. (plural of guinea pig English)
Usage examples of "guinea pigs".
When the dog's leashes had been hung up, I played with the cats and the guinea pigs.
You don't have to use two divisions or two guinea pigs or two anything.
They only needed six for the flights themselves, but they assumed that at least half the candidates would drop out because of the frustration of training to become passive guinea pigs in an automated capsule.
We'd be up in those white rooms like a bunch of fucking guinea pigs.