A practical handbook of British birds London, Witherby, 1920-24 Birds, Great Britain, rook, A series of illustrations depicting the head features of various bird species, arranged in a grid format. Each specimen demonstrates distinctive characteristics, showcasing differences in beak shapes, sizes, and feather textures. The images provide a detailed view of the avian anatomy, highlighting the diversity among the birds. The numbered labels assist in identifying each unique feature and indicate the order of the specimens for comparative study. This visual documentation serves as an educational resource for ornithologists and bird enthusiasts.