Zapiski moskovskogo biologa. Zagadki povedenii︠a︡ z︠h︡ivotnykh
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The great specialist in the studies of animal behavior L.V.Krushinsky dwells on the examples of animals’ rational activities. The conception about biological grounds of the rational activities of animals as a precondition of formation of the human thinking is presented in the book, which remained unpublished for 18 years.
