Studies of some species rarely photographed. XXXVI. The Nutcracker

(Plates 13-20). W E are grateful to Mr. Yeates for securing for us a series of photographs of the Nutcracker (Nucifraga caryocatactes) taken by Mr. P . O . ' S w a n b e r g who has devoted a great deal of time to the study of this species over the past ten years. W i t h one exception all the pictures show the Thick-billed form (Nucifraga c. caryocatactes) of which there have been rather fewer aut...