Йоханнес Герардус Кейлеманс (Johannes Gerardus Keulemans ; John Gerrard Keulemans; J.G. Keulemans. 1842-1912) — художник-орнитолог. Родился в Нидерландах, работал в Англии. Иллюстрировал журналы и важнейшие книги по орнитологии, такие как "История птиц Новой Зеландии" (Walter Lawry Buller, A History of the Birds of New Zealand. 1873, 1888), "История птиц Цейлона" (William Vincent Legge, History of the Birds of Ceylon. 1880), "Птицы Южной Африки" (Edgar Leopold Layard, Birds of South Africa. 1887), "История птиц Европы" (Henry Eeles Dresser, History of the Birds of Europe. 1871–1896) и множество других. Соблюдая требования научной иллюстрации, Кейлеманс создал точные, яркие и характерные рисунки, которые принесли ему известность в орнитологических кругах и полюбились ценителям прекрасного.
Johannes Gerardus Keulemans (John Gerrard Keulemans; J.G. Keulemans; 1842-1912) was an ornithologist artist. He was born in the Netherlands and worked in England. He illustrated magazines and important books on ornithology, such as "A History of the Birds of New Zealand" (Walter Lawry Buller, A History of the Birds of New Zealand. 1873, 1888), "A History of the Birds of Ceylon" (William Vincent Legge, History of the Birds of Ceylon. 1880), "Birds of South Africa" (Edgar Leopold Layard, Birds of South Africa. 1887), and "A History of the Birds of Europe" (Henry Eeles Dresser, History of the Birds of Europe. 1871–1896) and many others. Adhering to the requirements of scientific illustration, Keulemans created precise, vivid, and characteristic drawings that brought him fame in ornithological circles and were loved by connoisseurs of beauty.