This article focuses on the interactions between multi-level decision-making centers – local, national, international – in migratory species conservation in Suriname. Such multi-level interactions are crucial for transboundary conservation practices, but they have been researched very little by the scientific community so far, and not on Suriname at all. Moreover, although multi-level decision-making may differ per situation, it always poses governance and management challenges. To understand these, two Suriname case studies are analyzed in-depth: migratory shorebirds in the Bigi Pan Multiple Use Management Area and marine turtles in the Galibi Nature Reserve. A polycentric governance framework is used as an analytical lens, while a qualitative case study methodology is applied. The results of the analysis show that polycentric structures for the conservation of migratory species are currently only moderately in place and heavily dependent on donor finance. Yet, such vertical interactions are crucial for building connections – particularly among international NGOs, national governments and local communities – to achieve effective and legitimate conservation outcomes, irrespective of the presence or absence of donors. This paper, therefore, draws the following three key lessons for polycentric conservation efforts in the global South: (1) structural funding and alternative sources of income to donor money are crucial for transboundary conservation, (2) effective cooperation will require robust institution-building for enduring collective action, particularly at the local level, and (3) decision-making centers at all levels should be truly committed to a social-ecological approach of conservation, since a sole focus on biodiversity will not lead to legitimate results.