Paul D Stewart / Illustrated portraits of Richard Owen (20, July 1804- 18 December 1892) and Thomas Henry Huxley (4 May 1825 - 29 June 1895). Linley Sambourne's illustration for the new 1885 Macmillan edition of Kings...

Paul D Stewart / 1806 'Kangaroo' (Macropus giganteus), a copper engraving of a keeper attempting to box a kangaroo. First image of a boxing kangaroo, now an australian national icon. From Thomas Smith, 'The Naturalist...

Christian Ziegler / Ponerine Ant (Ectatomma sp) tending sap-sucking treehoppers in exchange for honeydew, Barro Colorado Island, Panama

Christian Ziegler / Ant (Azteca sp) pair coming out of a hole in stem of Cecropia (Cecropia sp) plants that offer ants space and food in exchange for protection against herbivores, Barro Colorado Island, Panama

Mark Moffett / Carpenter Ant (Camponotus sp) on tendril of host Villose Pitcher Plant (Nepenthes villosa) a symbiotic relationship where the ants help host digest insects in exchange for living space, Borneo

Mark Moffett / Carpenter Ant (Camponotus sp) on tendril of host Villose Pitcher Plant (Nepenthes villosa) a symbiotic relationship where the ants help host digest insects in exchange for living space, Borneo

Mark Moffett / Ant (Myrmicaria sp) group defend a young bamboo plant in exchange for nectar found between the plant's segments, Malaysia