Hummingbird Postcards Posted on 2012/05/20 by admin Sword-bill, ( Docimastes ensiferus ) by John Gould. From A monograph of the Trochilidæ, or family of humming-birds (1849-1861). This image (or other media file) is in the public domain because its copyright has expired. product tags: hummingbird, bird, vintage, watercolor, illustration, ornithology, postcards,