Zoochorous seed dispersal is an essential ecosystem services for plants and has become an important research area for several decades. However, no comprehensive information concerning diversity in endozoochory studies at the global level is present. Here, we assessed when, where, and which taxon of plants or animals was studied for endozoochory. We aimed to find disparities across studied taxon, ecosystems, and geography. A systematic review of 858 peer-reviewed studies on endozoochory published in the last five decades revealed a continuous growth in endozoochory studies since the 1970s with considerable imbalances at the geographical and ecosystem level; >50% of studies were conducted only in the temperate regions with a prominent focus on the forest ecosystem (46%). Among animals, 87% of the studies focussed on wild taxa. Poaceae (covering 125 genera/357 species) has been the largest endozoochorously dispersed plant taxa. Birds were the most diversely studied, covering 24.5% of the studies from 54 countries/regions. Although studies targeting domestic animals were low in number, they were found to disperse 26% of the plant species. The study suggests the need for more research from the data deficit global south which have complex fragile ecosystems to generate more in-depth knowledge on endozoochoric seed dispersal.