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- © Joseph Smit. By Joseph Smit (1836–1929); in an article by Isaac Bayley Balfour (1853–1922), Gustav Hartlaub (1814–1900), and Philip Lutley Sclater (1829–1913); engraved by the firm of M. & N. Hanhart
- Copyright licence: Marked as being in the public domain
- Provenance: http://media.eol.org/content/2012/06/15/08/76165_orig.jpg