Staff at Chester Zoo are celebrating after a pygmy marmoset, the world's smallest species of monkey, gave birth to twins.
Weighing just 15 grammes, the babies were born at the end of July but are only now big enough for visitors to spot.
The month-old pygmy marmosets, born to mum Audrey and dad Gumi, will only be 13cm long when fully grown.
Although the babies were tiny, they are relatively large, equating to around 10% of their mother's weight.
Eastern pygmy marmosets are found in the rainforests of South America and are under threat from wildlife loss and people trapping them for pets.
Dr Nick Davis, deputy curator of mammals at the zoo, said: