When she was bored of the gravel she noticed to two birds that hand been walking on the path a little ahead of us for a few minutes. As soon as she saw them she just had to Chase them. She did this a few times during the walk.
Then we went to a park and the gravel investigation began again only this time she enlisted the services of another little boy to help her in her quest. It was so cute to watch them follow each other around, and when they had finished playing together he ran across the park to give me more gravel! So generous!