A manatee was recently rescued from a storm drain in Melbourne Beach, Florida, highlighting the surprising and often unseen wildlife inhabiting America’s vast network of underground waterways.
The 185kg marine mammal became wedged in a baffle box – a chamber designed to filter debris from sewage systems – after apparently swimming into the structure through a storm drain in February 2026. The rescue required the combined efforts of multiple fire rescue units, the Florida Fish and Wildlife Service, University of Florida experts, and a local car-tow business, who used a sling to carefully extract the animal and transport it to SeaWorld Orlando for recovery.
While the incident involving the manatee is unusual, it’s far from isolated. A recent study conducted in Gainesville, Florida, deployed 39 cameras across 33 sewer sites, revealing a diverse ecosystem thriving beneath the city streets. Researchers identified 35 different species, including the American alligator, yellow-bellied sliders, raccoons, bats, and even nine-banded armadillos.
The alligators, researchers believe, are utilizing the culverts – sections of sewer running under roads – as safe passageways between ponds, and potentially as hunting grounds. Recordings showed alligators cornering fish in dead-end tunnels. Yellow-bellied sliders, the second-most frequently photographed reptile in the study, also appeared to be using the pipes as corridors for travel between bodies of water.
Raccoons proved to be the most common species observed, with cameras capturing around 1,800 images of the resourceful mammals. In a testament to their adaptability, some raccoons even damaged the research equipment, ripping cameras from their mounts.
The presence of rats in American sewers is, unsurprisingly, well-documented. While the exact number remains unknown, estimates suggest around 3 million rats inhabit New York City alone. The US spends approximately $18 billion annually addressing issues related to rat populations, including the spread of diseases like leptospirosis and hantavirus.
The Gainesville study also revealed a surprising number of bats, specifically Southeastern Myotis bats, roosting and foraging within the sewer system. Researchers observed the bats swooping down to the sewer floor to capture insects, suggesting the underground network provides a valuable food source. Similar behavior has been observed in Poland, where Myotis bats are known to apply storm sewers as maternity sites.
Birds, too, are drawn to the sewer environment. Carolina wrens were observed at six locations in Gainesville, sometimes carrying nesting material, hinting at the possibility of nesting within the sewer system itself. Other bird species frequent open-air treatment pools at sewage plants, drawn by the abundance of invertebrates.
Even nine-banded armadillos were spotted trundling through drainage tunnels in Gainesville. Eastern spadefoot toads were also documented, though researchers believe some may have accidentally fallen into the storm drains.
The US has over 700,000 miles of public sewer pipes, and the findings from Gainesville suggest these subterranean systems are far more biodiverse than previously understood. The study underscores the complex relationship between urban infrastructure and wildlife, and raises questions about the ecological role of these often-overlooked environments.
