I was in the Parker Preserve the other day, and came upon two fence lizards. The one in top of the photo had his jaw around the leg of the other one, and he was holding on for dear life. They panicked when they saw me and crawled 10 feet up a tree, and the one with the grip held on during the whole drag 10 feet across the sand and up the tree. They came back down, and I separated them.
