Difference | Wallace | Darwin
family background & class | middle class, working | wealthy elite, income from estate farm
collections | 10,000 specimens from Amazon; 125,000 from Malay; over 1,000 new species | 5,430 specimens
species in focus | collected widely in nature | studied especially domesticated animal breeds
field observations | focused on groups | focused on individuals
relationship with native cultures | peers who helped him hunt, collect, travel | mostly hired as assistants, or as "curiosities"