There's a double celebration going on at Bristol Zoo Gardens. One of the world's most endangered species of monkey - the golden lion tamarin - has given birth to twins!
The tiny monkeys are just three weeks old, and have been clinging onto their parents' backs for days. They'll grow to be the size of a small squirrel and have long, silky fur.
Not only is it great news for the zoo, but it's a boost for the species, as there are only around 1,000 left in the wild - mainly in Brazil.
It's tiring being so cute - check out this baby's big yawn! Zoo keeper Mel Gage said breeding these endangered monkeys was "hugely important".