This little grumpy guy is the pygmy marmoset. It's the smallest monkey in the world, growing only as large as the human hand and weighs about as much as a stick of butter. . . . . . . #animalsofinstagram #animalplanet #animaloftheday #wild #wildlife #outdoors #animals #wildanimals #conservation #nature #animallovers #instanature #wildgeography #marmoset