Between man and animals there is a gap that cannot be bridged. The man ascended heights of existence that not to be reached by animals. Owing to abstract thinking and speech he attained a new level of intellectual ability. But he cannot deny psychological affinity with animals. What we have in common with higher vertebrates is not just a way we get food after birth. There is, to a certain degree, a common emotional sphere.
Ceprologic examination of representatives of 9 monkey species carried out in the Wrocław Zoo revealed the folloving intestinal parasittes: Trichocephalus trichiurus, Strongyloides stercoralis, Nematodirus weinbergi, Ascaris lumbricoides, Enterobius vermicularis and Capillariidae gen. sp. The total extensity of infection was 80%, however intensity was rather low, except for E. vermicularis found in chimpanzees. It seems, that nematoda present the most important problem in control of parasitic infection in zoological gardens.