At a time when seabird populations have experienced steep declines and the movement of diverse species into cities has become a globally important issue, the paper examines the contested presence of an urban seabird colony in North East England. Drawing on ethnographic research, the paper details how avian claims to space have prompted fraught debates on coexistence, urban planning, and socio‐environmental futures that reveal an inherently ambivalent politics. While normally a coastal breeding bird, the paper argues that the Tyne kittiwakes – and their use of window ledges, drain‐pipes, streetlights, rooftops and road infrastructure – have become a familiar part of the region's urban life. However, while their presence has reworked understandings of public space, urban belonging, and oceanic boundaries, urban regimes of control and normative notions of the city continue to inhibit a more expansive urban politics capable of accommodating difference and responding to environmental change. Through attention to practices of deterrence, shifting forms of urban decision‐making, and the emergence of the kittiwake as a regional icon, the paper documents the conditions that limit coexistence despite a change in attitudes towards the colony and environmental futures more broadly. In this context, the paper raises fundamental questions about how to support coexistence amid ambivalence without resorting to normative forms of species valorisation. Attending to ambivalence and the difficulty of creating and sustaining ethical modes of coexistence, the paper reflects on the implications of the research for urban futures, local geographies of the sea, and the multispecies city.