The marsh deer, also known as the swamp deer or the Brazilian deer, is a species of deer that is found in the flooded grasslands and wetlands of South America. Its scientific name is Blastocerus dichotomus. There are several synonyms for the marsh deer, including the capybara deer, the roe deer, the red deer, and the sambar deer. These names are often used interchangeably, depending on the region and cultural context. Despite their different monikers, all of these deer species share similar physical features, such as their medium-sized stature, brown coat, and impressive antlers. However, the marsh deer is known for its distinctive white markings on its tail and rump, which set it apart from other deer species.