how did pygmy marmoset(finger monkey)rise to the top

https://www.youtube.com/channel/UCm1PS7o2U39LnOZdhDuoE-Q
Amazing Pygmy Marmoset Facts
• Pygmy marmosets (also called finger monkeys) live in the tops of trees in the rainforests of South America

• These #animals have fingernails they use as claws to climb trees

• Butterflies, fruits, berries and tree sap are
all favorite foods of this small omnivore

• One male and one female pygmy marmoset breed and live together for a lifetime

• #Pygmymarmoset groom each other’s fur just like other monkeys do #fingermonkey