Last year we had some birds build a nest in the roof of our sand box. They even hatched eggs there. This spring Larry or Ethan (not sure which one first) got the nest out. We were surprised to see one of the hatched eggs and one that never hatched still in it. It was quiet the find. Our kids were really excited about it. We could see all the cool stuff they used to make there nest (including lots of white hair courtesy of our white rabbit I am sure!) Ethan was thrilled because his class is studying birds and has gone on bird watching field trips. I got a large sour cream container, washed it out and sent it to school with him. It is quit the hit with his class and teacher!