Wirtz, P.; Oldekop, G.: Time budgets of Waterbuck (Kobus ellipsiprymnus) of different age, sex and social status. Zeitschrift für Säugetierkunde 56, pp. 48 - 58 (1991)
Wirtz, P.; Kaiser, P.: Sex differences and seasonal variation in habitat choise in a high density population of Waterbuck, Kobus ellipsiprymnus (Bovidae). Zeitschrift für Säugetierkunde 53, pp. 162 - 169 (1988)
Taborsky, M.; Hudde, B.; Wirtz, P.: Reproductive behaviour and ecology of Symphodus (Crenilabrus) Ocellatus, a European wrasse with four types of male behaviour. Behaviour 102 (1), pp. 82 - 117 (1987)
Wirtz, P.: Co-opertive prey capture in the great white pelican (Pelecanus onocrotalus) at Lake Nakuru, Kenya. Zoologische Jahrbücher Abteilung für Systematik, Ökologie und Geographie der Tiere 113, pp. 37 - 43 (1986)
Wirtz, P.; Diesel, R.: The social structure of Inachus phalangium, a spider crab associated with the sea anemone Anemonia sulcata. Zeitschrift für Tierspychologie 62 (3), pp. 209 - 234 (1983)
Wirtz, P.: Territory holders, satellite males and bachelor males in a high density population of Waterbuck (Kobus ellipsiprymnus) and their associations with conspecifics). Zeitschrift für Tierpsychologie 58 (4), pp. 277 - 300 (1982)
Wirtz, P.: Territorial defence and territory take-over by satellite males in the waterbuck Kobus ellipsiprymnus (Bovidae). Behavioral Ecology and Sociobiology 8 (2), pp. 161 - 162 (1981)
Wirtz, P.: A revision of the Eastern-Atlantic tripterygiidae (pisces, blennioidei) and notes on some Westafrican blennioid fish. Cybium 11, pp. 83 - 101 (1980)
Wirtz, P.; Kacher, H.: Pelecanus onocrotalus. Kooperativer Fischfang. Wissenschaftlicher Film E 2783, Publikationen zu Wissenschaftlichen Filmen 16, pp. 3 - 6 (1983)
Kacher, H.; Schaller, D.; Wirtz, P.: Ctenopoma multispinnis. Fortbewegung an Land. Wissenschaftlicher Film E 2519, Publikationen zu Wissenschaftlichen Filmen 12, pp. 3 - 9 (1979)
Wirtz, P.; Kacher, H.: Clinitrachus argentatus (Clinidae). Laufen mit den Bauchflossen. Wissenschaftlicher Film E 2425, Publikationen zu Wissenschaftlichen Filmen 10, pp. 3 - 6 (1977)