Circus pygargus source: NATURGESCHICHTE DER VÖGEL MITTELEUROPAS: Band V, Tafel 58 - Gera, 1899 (http://www.biologie.uni-hamburg.de/b-online/birds/1617_10...
Circus pygargus Public domain image of Montague's harrier from http://www.biologie.uni-hamburg.de/b-online/birds/regengl.htm https://creativecommons...
taxonomy:binomial Circus pygargus taxonomy:common Montagu's harrier harvard university mcz ernst mayr library taxonomy:binomial circus pygargus taxonomy:common...
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