Why is keeping a single tamarin often detrimental to its psychological well-being?

Answer

They thrive best when living with other tamarins (conspecific interaction)

Their social requirements mandate that keeping a single tamarin is often detrimental because they thrive best when living with other tamarins.

Why is keeping a single tamarin often detrimental to its psychological well-being?
behavioranimalMonkeyPrimatetamarin