Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: i made a squirrel friend today! i gave him the core of the plum i was eating. he seemed very happy.
This tweet contains emotions: 
joy, love, optimism