Baby boom at zoo
22 January 2013 Last updated at 08:13 GMT
Chester Zoo is in the middle of a baby boom.
Over the last few months, animals such as black rhinos, giant anteaters and Asian elephants - which are endangered in the wild - have been giving birth to babies at the zoo.
Many of these species are extremely difficult to breed in captivity, so it's a real achievement.
Nel's been finding out the secret of their success.