Niko Tinbergen... the founder of the science of ethology. Professor Tinbergen has spent a lifetime of research exploring the behavior of many types of animals in their natural environments, & has founded centers of worldwide renown for research & teaching in the behavioral sciences, first in his native Holland & later at Oxford. His influence extends far beyond the borders of Europe and of zoology proper, and he has contributed substantially to international & interdisciplinary collaboration." 

Niko Tinbergen is one of the grand masters of ethology & the papers published here are among its most important documents: they are a source-book for students of animal behaviour & will give the historian of ideas an insight into the early days of one of the most influential movements in modern science ―Sir Peter Medawar