Cerdocyon thous, also known as the crab-eating fox, inhabits South America's diverse ecosystems, from savannas to forests. This adaptable omnivore is known for its greyish coat, bushy tail, and nocturnal habits. It feeds on a varied diet, including fruits, small mammals, and insects, and plays a crucial role in seed dispersal.

Cerdocyon thous, commonly known as the Crab-eating Fox or Savanna Fox, is native to South America. Its geographical distribution includes countries such as Brazil, Argentina, Uruguay, Paraguay, Bolivia, Peru, Colombia, Venezuela, Guyana, Suriname, and French Guiana. The species is widely found in the tropical and subtropical regions of the continent.

Cerdocyon thous typically inhabits a variety of environments, including savannas, forests, shrublands, and grasslands. It is commonly found in open and semi-open areas with a preference for regions that provide both cover and open spaces for foraging. The species can adapt to different altitudes, from sea level to montane regions, and is often found in areas with moderate rainfall and warm temperatures.

As an omnivorous species, the Crab-eating Fox has a versatile diet that includes fruits, insects, small vertebrates, and carrion. This dietary flexibility allows it to thrive in diverse habitats. It plays a role in seed dispersal due to its fruit consumption and contributes to controlling insect and small vertebrate populations. The species is nocturnal and crepuscular, often active during the cooler parts of the day and night.