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ପକ୍ଷୀମାନଙ୍କର ବିବର୍ତ୍ତନ ଓ ବର୍ଗୀକରଣ 

ପ୍ରଥମ ଜୀବବିଜ୍ଞାନ ଭିତ୍ତିକ ଶ୍ରେଣୀବିଭାଗ ଫ୍ରାନସିସ ୱିଲୁଗ୍ୱୀ (Francis Willughby) ଓ ଜନ୍ରେ (John Ray) ତାଙ୍କ Ornithologiaeରେ ଲେଖିଥିଲେ ।

ଆଧାର

ଅଧିକ ତଥ୍ୟ 

 Avibase —The World Bird Database
 Birdlife International—Dedicated to bird conservation worldwide; has a database with about 250,000 records on endangered bird species.
 Bird biogeography
 Birds and Science  from the National Audubon Society
 Cornell Lab of Ornithology
 
 Essays on bird biology
 International Ornithological Committee
 North American Birds for Kids
 Ornithology
 Sora —Searchable online research archive; Archives of the following ornithological journals The Auk, Condor, Journal of Field Ornithology, North American Bird Bander, Studies in Avian Biology, Pacific Coast Avifauna, and the Wilson Bulletin.
 The Internet Bird Collection—A free library of videos of the world's birds
 The Institute for Bird Populations, California
 list of field guides to birds , from the International Field Guides database
 RSPB bird identifier—Interactive identification of all UK birds

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