Birds that dine on the snails use the shells to help grind up food in their stomach.
(Birds; use; the shells; to help grind up food in their stomach) Context(Birds use,List([0, 33))):(Birds; use the shells dine; L:on the snails) Context(Birds use,List([0, 33))):(Birds; use the shells to help; grind up food in their stomach) Context(Birds use to help,List([0, 52))):(Birds; use the shells to help grind up; food)
Birds use,List([0, 33)) Birds use,List([0, 33)) Birds use to help,List([0, 52))
Birds Birds Birds Birds
use use the shells dine use the shells to help use the shells to help grind up
the shells to help grind up food in their stomach
L:on the snails
grind up food in their stomach
food