Already the smallest monkey in the world, these baby marmosets are absolutely itty-bitty. Baby pygmy marmosets can currently only be spotted by very keen-eyed visitors to Lakes Aquarium in the UK. They appear as furry lumps on the backs of their parents – most often their father.
These little babies only weight half an ounce!
This last picture actually comes from the Everland Zoo and Theme Park in South Korea, but should give you an idea of scale.