1. Über das Zeitgedächtnis der Bienen;Beling;Z. vergl. Physiol.,1928
2. The rat's anticipation of two meals a day;Bolles;J. comp. physiol. Psychol.,1973
3. Adaptive daily strategies in behaviour;Daan,1981
4. Biological rhythms in the marine environment;DeCoursey,1976
5. The effect of daytime, tides and other factors on some activities of lesser blacked-backed gulls, Larus fuscus;Delius;Rev. Comp. Animal.,1970