A poem by Scottish poet Gordon Meade from his Zoospeak series, which attempts to give voice to animals living in captivity.
Common chimpanzees usually live in patriarchal societies, yet at Warsaw Zoo a group of females began to lead the troop. Our correspondent tells the story of their ruthless rise to the top.
Many animals self-medicate with natural drugs in order to prevent or cure diseases and infections. Their behaviour could have important implications for human medicine, too.