Eucalyptus Nuts

Aren't these neat looking? Behind my father's house is Mt. Davidson, which was planted with thousands of Eucalyptus trees many years ago. The trees drop these nuts all over the place and these two fell from a tree, rolled off the mountain and onto the sidewalk, where I found them for this picture! :)

This image was taken during my trip to San Francisco during September 12-15, 2011.