A History of the Birds of Europe
The "Birds of Europe" continued a tradition dating from the seventeenth century whereby the study and classification of specimens operated largely independently of those field observers who studied behaviour and ecology , a rift that continued until the 1920s , when the German naturalist Erwin Stresemann integrated the two strands as part of modern zoology . 
<triplet> Erwin Stresemann <subj> zoology <obj> field of work