The number of legal experts specialising in defending the rights of animals has been on the increase.
A huge population of chimpanzees appears to be thriving in the Democratic Republic of Congo.
Scientists believe that our slow metabolic rate is the key to explaining our relative longevity.
The Nonhuman Rights Project has been battling to grant some species of animals 'legal personhood'.
One of the world's leading hybridization experts believes that humans did not evolve entirely from apes.