It was after midnight in Quito when Stella de la Torre came for me, waiting under a streetlamp next to the black minivan that would ferry us to the Amazon, to see the smallest monkey in the world.

From their adorable facial expressions to their remarkable social skills, you'll fall in love with pygmy marmosets. Explore Subscribe Newsletters Content Licensing ...

The pygmy marmoset weighs approximately 3.5 ounces and measures less than 5 inches in length, making it the smallest monkey in the world. In mid-March, Saudi Arabia withdrew its ambassador to ...