Crabs - Land and Head

CNN has this video about the invasion of land crabs.
I don't want to see it, but I did want to know more...

So I went to wikipedia.

The article, http://en.wikipedia.org/wiki/Land_crab, was sparse.

So I compared it to the article for Head Crab, http://en.wikipedia.org/wiki/Head_crab. And now land crab looks really really sparse.