The number of water voles in our region has been declining rapidly over the last century.
The People's Trust for Endangered Species is now asking for the public's help to count how many of the animals live across the South.
Conservationists say habitat loss and the release and spread of American mink has led to the problem.
A zoo keeper has been looking after critically endangered monkeys in Indonesia.
Jodie Dryden, who works at from Drusillas Park in East Sussex, has been assisting a programme for five weeks to raise awareness of the endangered black macaques in the wild.
The macaques species are looked after at Drusillas but their population in the wild has declined by 80% over 40 years because of habitat destruction and hunting.
The primates are considered a local delicacy and are being killed at an unsustainable rate.
Jodie said: "I work closely with the family group of macaques at Drusillas and have a keen interest in this species. I wanted to do something extra to help and the Selamatkan Yaki programme seemed perfect."
The birth of a critically endangered black rhino at a wild animal park in Kent has brought new hope for the survival of the species.
The newborn female is the first calf for mum Nyasa at Port Lympne.
Keepers say both are doing well.
Click on the video below to see the new arrival.