Monkeys by J G Keulemans (1896)

Johannes Gerardus Keulemans (J. G. Keulemans) (June 8, 1842, Rotterdam - March 29, 1912, Ilford, Essex (now part of London)) was a Dutch bird illustrator.

John Gerrard Keulemans (1842-1912)
John Gerrard Keulemans was one of the most prolific natural history artists of the late nineteenth century. Born in Rotterdam, The Netherlands, in 1842, he spent his early years collecting specimens of wild animals and supplying them to museums.
Keulemans was greatly encouraged by H. Schlegel, the director of the Natural History Museum in Leiden. He sent Keulemans on an official expedition to West Africa in 1864, where Keulemans sketched wildlife and made field notes. On Keulemans' return to Europe in 1866, Schlegel recommended him to the British Museum.
In 1869, Keulemans emigrated to England where he lived for the rest of his life, working as a professional natural history artist painting birds and other animals. He seems to have received no formal art training, but was self-taught, drawing animals in the wild from an early age. His bird illustrations in particular possessed all of the key elements that his patrons required. His drawings were scientifically accurate, often attractive compositions. Keulemans was highly productive and reliable; for 30 years he produced more bird paintings than any contemporary, published in 100 major bird books and journals.
Much of Keulemans' artwork appears similar in composition. This is largely due to the requirements of his employers and the fact that he worked mainly from skins. But left to his own devices, Keulemans produced some outstanding large paintings. These included depictions of immense flocks of birds, which demonstrated that he was capable of much more creative work than his published work might indicate. He died in 1912.