We have become... the only animals to:

"This gargantuan granary is evidence that we have become, after several thousand years of effort, in the industrialized world at least, the only animal to have wrested ourselves from an anxious search for the only source of the next mean and therefore have opened up new stretches of time - in which we can learn Swedish, master calculus and worry about the authenticity of our relationships, avoiding the compulsive and all-consuming dietary priorities under which still labour the emporor penguin and Arabian oryx." - Alain de Botton

What else are we the only animals to do?