Most people know the phrase "stubborn as a mule." The figure of speech has a basis in reality. Donkeys be temperamental and sometimes like to throw their passengers. Nobody knows this better than they're haulage operator Rufino de la Cruz. Still, the donkey is his favorite animal. He needs them to deliver goods in his hometown in Peru.

About 'My favorite'

With all the talk of endangered species, the value of biodiversity and the usefulness of ecosystems we sometimes forget why plants and animals are really worth protecting: because we love them, or depend on them for our very own wellbeing. People from all walks of life and in all parts of the world have a favorite species. The reasons are many - perhaps because it is beautiful, or fascinating, or it helps them secure a livelihood. Meet some of these people and their favorites in our series "My favorite."