In the water kingdom amusement park, when two sea lions throw and catch balls on their nose, they are rewarded every time with fish after they successfully complete their act. the sea lions have been trained to perform this behavior through

This has been learned through operant conditioning. The sea lions have been trained (conditioned) to receive a reward after they balance the ball. The act of balancing the ball is the learned behavior, and the reward (positive reinforcement) is the receipt of fish from the trainer.