Note yy — BOOK IV.
Reading edition
To assist in which Office, they swallow small angular Stones, which are to be met with in the Gizards of all granivorous Birds; but in the Gizard of the Iynx, or Wryneck, which was full only of Ants, I found not one Stone. So in that of the Green Wood-Pecker (full of Ants and Tree-maggots) there were but few Stones.