This is an arrow crab. Notice how he walks on eight slender legs and uses two shorter legs to eat with. Not all crabs are as thin as the arrow crab.

More about crabs. Wikipedia article (http://en.wikipedia.org/wiki/Crab) British Marine Life Study Society Answers the question, "Why do crabs walk sideways?" (http://homepages.ed.ac.uk/evah01/crabs.htm) © 2013 Jerry Jindrich. All rights reserved. Revised 1/25/2016.