Spider,sand,horseshoe
... Pairs often dig into 
the sand above the low tide mark but not too high either, because the sand will... [DOC] [TLE] beach learning: hermit crabs, horseshoe crabs, ghost crabs, sand ... [PAR] beach learning: hermit crabs, horseshoe crabs, ghost crabs, sand crabs ... Video 
from Between the Lions: If you were a spider crab; Animal Spot: Ghost Crab.