Bonding By Vera Nobre

One reason why doubts still arise about the inner world of animals is the fact that even today many feelings and other mental processes are not clearly defined, not even in relation to humans. Consider, for example, "happiness," "gratitude," and "thought." These are difficult concepts to describe. How can we understand in animals something that we don't even understand in ourselves? Page 237 @peter_wohlleben in The Secret Life of Animals