This paper addresses the biosemiotic dimensions of human relationship with captive animals and aims to uncover how these factors influence handling practices and human-animal interactions within zoological gardens. Zoological gardens are quintessential hybrid environments, and as such, they are places of interspecies interactions and mutual influences. These interactions are profoundly shaped by human attitudes towards animals. The roots of these attitudes can be found at the cultural and institutional levels as well as at the biosemiotic level. Previous studies have suggested (...) that keepers’ attitudes towards animals have direct influences on their handling style and, consequently, have an impact on animals’ perception of keepers and other humans. This suggests that the type of relationship between keepers and animals can translate into handling styles that may affect animals’ perceptions of humans and worsen or improve their welfare. In this paper, we present a case study involving chimpanzees’ keepers at the Tallinn Zoological Gardens. A series of interviews were conducted, which aimed to uncover the way keepers understand their relationships with captive animals and how this influences handling. This work offers a comparative approach by bringing forward the experiences of keepers who work with various animal species belonging to different taxa and class. Such an approach aims to highlight the biosemiotic factors behind the emergence of different types of keeper-animal relationships. We expect to uncover whether extremely different Umwelten may shape human-animal bonds. By highlighting the agency of animals in daily activities and work routine, we also aim to initiate a discussion on the way animals influence handling practices within zoological gardens. Our objective is to understand how individual animals influence handling practices within zoological gardens. (shrink)