@book{bhlitem67978, title = {Principles of animal understandings; a constructive essay on the intercourse in the animal world }, copyright = {NOT_IN_COPYRIGHT}, url = {https://www.biodiversitylibrary.org/item/67978}, note = {https://www.biodiversitylibrary.org/bibliography/26010}, publisher = {New York, 1905}, author = {Toenjes, Hermann.}, year = {}, pages = {66}, keywords = {Animal intelligence|}, }