The Brow-antlered Deer, also known as Sundarbans deer or Rucervus eldii, is a species native to the wetlands of Southeast Asia, particularly found in the Sundarbans region of India and Bangladesh. This deer is notable for its unique antlers, which have a distinctive brow tine that resembles a "brow" above the main beam. They are medium-sized, with males typically larger than females, and they inhabit marshy areas, grasslands, and forests. Brow-antlered Deer are herbivorous, primarily feeding on grasses, leaves, and aquatic plants. They are social animals, often found in small groups, and are known for their shy and elusive behavior. Due to habitat loss and hunting, their population has declined significantly, leading to their classification as an endangered species. Conservation efforts are underway to protect their remaining habitats and ensure their survival.