Pygmy marmoset
Pygmy marmosets, sometimes called pocket monkeys, are even tinier than they appear because their fur is so fluffy. Weighing only five ounces, they could easily fit into the palm of your hand. They like to live high in the treetops where they can find their favorite food: tree gum and sap.
They’ll eat fruit and insects if necessary. They have a high infant mortality rate, due to starvation and falling out of trees, with only 25 percent of babies reaching adulthood.
Like the gray wooly monkey, the pygmy marmoset is kidnapped and sold illegally as pets. Deforestation is also a threat.