The aim of this study was to demonstrate the differences and similarities in the behavior of two common species of grazing herbivores (cattle and horses) and to verify whether the behavior of animals reared in conditions similar to the natural habitat affects to change their behavior and promotes the occurrence of behaviors typical of free-living ancestors. Behavioral observations of 500 cows and 40 horses were carried out for fourteen days. To obtain knowledge about the mode of living of individuals and create etogram and develop data on the circadian rhythm both stocks observations madesent in two different times of day. The studies indicate a pattern replicating the daily behavior of both stocks. Animals despite species differences did not show aggression towards each other, tolerate their presence. Domesticated animals-cattle and horses, well adapted the conditions in which the existence of their free-living ancestors. Maintaining the green areas such as landscape parks, national parks and their buffer zones can be a very positive element in shaping the ecosystem.

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