What defines the diet of New World monkeys classified as *gummivores*, such as marmosets and tamarins?

Answer

A significant portion of their diet is sap or gum tapped from trees.

Gummivores, like marmosets and tamarins, consume a significant portion of their diet as sap or gum tapped from trees, which requires specialized dental and digestive adaptations.

What defines the diet of New World monkeys classified as *gummivores*, such as marmosets and tamarins?
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