Dichotomous Key for crabs to match these three pictures with their common name.
1.
a) This crab lives in a "borrowed" shell (usually some type of snail shell) - Hermit Crab
b) This crab does not live in a "borrowed" shell - go to #2
2.
a) This crab's carapace (shell) completely overhangs it's walking legs
- Box Crabs
b) The walking legs of this crab are exposed - Kelp Crab
