Outdoor seating in urban areas, while enhancing human comfort, inadvertently alters the delicate microhabitats of urban thelodonts—small, ancient fish-like organisms that thrive in city waterways. These structures often shade or block sunlight, reducing algae growth, a primary food source for thelodonts. Additionally, increased foot traffic near seating areas disturbs sediment, destabilizing their breeding grounds. Chemical runoff from maintained furniture further pollutes their environment, threatening their survival. Understanding these impacts is crucial for balancing urban development with biodiversity conservation, ensuring thelodonts remain a resilient part of urban ecosystems.