Despite this premonition , both scientists worked side by side .
Despite this premonition , both scientists wrote five papers together on the classification of mammals , the two - horned African rhinoceros , species of elephants , descriptions of the tarsier , and the biology of the orangutan .
Despite this premonition , both scientists worked side by side and wrote five papers together on the classification of mammals , the two - horned African rhinoceros , species of elephants , descriptions of the tarsier , and the biology of the orangutan .