Millions of years ago, our most distant ancestors swapped swinging in trees for walking on the ground and according to scientists, that same process is beginning again.
Monkey and lemur species which have always been known to live in trees are now beginning to spend a lot more time roaming the forest floor in response to devastating levels of deforestation and climate change.
A new study which was based on more than 150,000 hours of observation, looked at 47 tree-dwelling primate species living across almost 70 sites in Madagascar and the Americas.
