The capybara (Hydrochoerus hydrochaeris) stands out as the world’s biggest rodent, measuring 3–4 ft (≈ 90–120 cm) in length, up to 2 ft (≈ 60 cm) at the shoulder, and weighing up to 174 lb (≈ 79 kg). That’s roughly twice the size of the North American beaver, the second‑largest rodent.
While it bears a resemblance to a beaver, the capybara lacks a flat tail and has a more streamlined build. Its partially webbed toes and ears that sit high above the water surface make it perfectly suited for life in shallow rivers, swamps, and wetlands. These environments provide both a refuge from predators such as jaguars and boa constrictors and a source of hydration for its naturally dry skin.
Capybaras are more closely related to guinea pigs and rock cavies, all of which share the same South American origin. Their range extends from Panama through the Amazon basin to northern Argentina.
In recent years, capybaras have gained a cult following on TikTok and Instagram. Their playful habits—hiccuping, grooming other animals, and lounging by the water—have made them internet sensations. Yet one of their most unusual behaviors, which may seem unappealing at first glance, is coprophagia, or the consumption of their own feces.
Capybaras feed almost exclusively on grasses and aquatic plants, foods high in fiber that are tough to digest. To extract the maximum nutrition, they rely on a two‑stage digestive process. After an initial round of digestion, they allow their first set of pellets to sit overnight, letting microbes break down the remaining fiber. In the morning, they eat these partially digested pellets, effectively re‑digesting the meal and recovering nutrients that would otherwise be lost.
This behavior, known as coprophagia, is common among many herbivorous rodents—including mice, rats, and guinea pigs. In some species, even neonates consume their mother’s feces to help establish a healthy gut microbiome. Capybaras’ habit is therefore an evolutionary adaptation rather than a sign of poor health.
Capybaras have crossed the Atlantic and are now established in parts of the United States. The first recorded escape occurred in 1994 when a group fled a Gainesville, Florida, conservation facility after a hurricane. Since then, sightings have increased, with estimates of at least 50 individuals in the mid‑2010s. The problem is compounded by the ownership of capybaras as exotic pets and their subsequent escape.
Although capybaras have not yet been identified as a major ecological threat in Florida, their presence is not without risk. They can carry a variety of pathogens that may be transmitted via ticks to humans, and they have been implicated in spotted fever outbreaks in Brazil. Vigilance is therefore advised, especially for outdoor enthusiasts.
Capybaras are difficult to spot in the wild, but their droppings provide a clear giveaway. They excrete olive‑shaped pellets that are less odorous than those of many other mammals. The first set of feces is pale, while the second, after coprophagia, is dark brown or black—an unmistakable sign of their feeding routine.
