How many frogs can you find? Click for a much larger image (328KB).
Taken at the pond waterfall yesterday afternoon.
I may be wrong but I think this is a picture of a wild cucumber
It's a land urchin.
I enjoy the idea of land urchins walking amongst us.
According to links I found it's a Bur or Wild Cucumber, or Echinocystis lobata.
Handy to have if you find yourself needing to make doll underwear:
http://www.naturenorth.com/fall/cucumber/nnz-cuc1.html