The capability of self-awareness is a prime indicator of the immense capacity for thinking and intellect that exists in the elephant. Elephants can recognize themselves in a mirror. Why do elephants have such large brains – an average mass of over 5kg? Elephants display a wide range of emotions. They display grief. They mourn their dead. They display great joy. Elephants use tools and have been observed taking actions that meet the criteria for artistic expression.