What were the subjects in the Harlows' studies that used wire-mesh surrogate mothers?

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The Harlows' studies famously used rhesus monkeys to explore the effects of maternal separation, social isolation, and dependency needs. They demonstrated the importance of caregiving and companionship in social and cognitive development by comparing monkeys raised with wire-mesh surrogate mothers to those raised with soft, cloth-covered surrogates.

What Were the Subjects in the Harlows' Studies That Used