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...rdLife International | title = ''Cygnus olor'' | journal = [[IUCN Red List of Threatened Species]] | volume= 2012 | page = e.T22679839A40128183 | publish ...987 |title=Wildfowl: An Identification Guide to the Ducks, Geese and Swans of the World |publisher=A & C Black |isbn=0-7470-2201-1}}</ref> Measuring {{co

| image = The book of antelopes (1894) Saiga tatarica.png | range_map_caption = Reconstructed range (white) and current distribution of the two subspecies ''Saiga tatarica tatarica'' (green) and ''S. t. mongolic

| image_caption = Two cephalons of the trilobite ''Trimerocephalus interruptus'' ...' species (Trilobita, Phacopidae) from the Late Devonian (Early Famennian) of Poland|journal= Zootaxa|volume= 3626|issue= 3|pages= 345–355|url= http://