Lion marmoset is a unique and uncommon term that refers to a small type of monkey found in South America. However, there are several synonyms that can be used to describe this cute and furry animal, including pygmy marmoset, pocket monkey, and finger monkey. These tiny primates are known for their adorable appearance, with their small size and big eyes making them an attractive choice for those looking for a unique pet. While they may be small, lion marmosets are incredibly social creatures, living in groups of up to 15 individuals, and displaying a range of behaviours such as grooming each other and communicating through a series of chirps and calls.