Book reviewed in this article:Andrew, R. J.(1963): The origin and evolution of the calls and facial expressions of the Primates.Larsson, K.(1963): Non‐specific stimulation and sexual behaviour in the male Rat.Eisner, E.(1963): A quantitative study of parental behaviour in the Bengalese Finch.Blest, A. D., und T. S. Collett(1963): The effects of some metabolic inhibitors on the rocking response of a Hemileucine Moth.Haufe W. U.(1963): Ethological and statistical aspects of a quantal response in mosquitoes to environmental stimuli.Ruwet J.‐C.(1963): Observations sur le comportement sexuel deTilapia macrochirBlgr.Kavanau, J. L.(1963): Compulsory regime and control of environment in animal behaviour.Ellis, P. E.(1963): An experimental study of feeding, basking marching, and pottering inLocustnymphs.Hersher, L., J. B. Richmond und A. U. Moore(1963): Modifiability of the critical period for the development of maternal behavior in Sheep and Goats.Whalen, R. E.(1963): Sexual behavior of Cats.Waller, P. F. und M. B.(1963): Some relationships between early experience and later social behavior in Ducklings.Denton, D. A., und J. R. Sabine(1963): The behaviour of Na deficient Sheep.Geist, V.(1963): On the behaviour of the northamerican Moose(Alces alces andersoniPeterson 1950) in British Columbia, (Über das Verhalten des nordamerikanischen Elches in British Columbia.)Thorpe, W. H.(1963): Learning and instinct in animals (Lernen und Instinkt bei, Tieren).B. Rensch(1962): Gedächtnis, Abstraktion und Generalisation bei Tieren. Arbeitsgemeinschaft für Forschung des Landes Nordrhein‐Westfalen, Natur‐, Ingenieurs‐ und Gesellschaftswissenschaften HeftK. v. Frisch(1963): Geheimnisse der Tiersprache.W. von Sanden‐Guja(1963): Mein Teich und der Frosch.Peiper, A.(1961): Die Eigenart der kindlichen Hirntätigkeit.R. L. Fantz(1963): Pattern vision in newborn infants.Koenig, O.(1962): Kif‐Kif. Menschliches und Tierisches zwischen Sahara un