In Harry Harlow's research with monkeys raised with surrogate mothers, the infant monkeys were given a choice of being raised in either a cage with a metal surrogate mother that had a source of milk or being raised in a cage with a soft terrycloth surrogate that had no milk supply.

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Harlow's research involved raising infant monkeys in which two surrogates were placed, one with milk made of metal and one without milk made of soft terrycloth. The results was that the infant monkeys spent more time with the soft, nonnutritive surrogate and became more attached to it, even though it provided no food.

In Harry Harlow's Research with Monkeys Raised with Surrogate Mothers