For 18 years Dian Fossey worked tirelessly on saving mountain gorillas from possible extinction.
Twenty five years after her brutal murder in Rwanda, she is still a conservation icon.
How did Michaela Strachan find being a penguin conservation volunteer?
The discovery of a new powerfully built ape fuelled stories of savage beasts.
The largest of the primates, gorillas aren't as savage as they were once thought to be.
Penguin populations around the world are declining - here we focus on the African species.
Dian Fossey was a prominent American primatologist studying mountain gorillas in Rwanda.
Watch a clip of the series covering Lions on the Move.
View images of Sir David Attenborough as he presents Gorilla Revisted.
Everyone has a soft spot for the iconic orang-utan, the king of the swingers.