Library of Congress:
QL Zoology
QL 671- 699 Birds
QL 671 Journals, societies' publications, congresses, yearbooks on birds
QL 675 Birds' eggs and nests
QL 676.7 Rare and endangered species
QL 677 Classification and Nomenclature
QL 677.3 Evolution
QL 681 North American and the United States
QL 685 Canada
QL 686 Mexico
QL 690 Europe
QL 692 Africa
QL 694.5 Atlantic islands
QL 695 Arctic regions
QL 695.2 Antarctic regions
QL 696 Systematic divisions. by order and family, A-Z
QL 696 P2 Passeriformes
QL 697 Anatomy and morphology
QL 698 Phyiology
QL 698.3 Behavior
QL 698.5 Song
QL 698.7 Flight
QL 698.8 Navigation
QL 698.9 Migration