I found some horseshoe crab shells on my summer trip to Cape Cod with my family. I thought they might be interesting to see for those who may not be able to visit the beach all the time, as they're a really cool animal. They not really a crab! They're also ancient - the species is 200 million years old, according to this Rhode Island Sea Grant Fact Sheet.
Here are a couple of pictures of the first one I painted, along with one I left unpainted.
