The nilgai (Boselaphus tragocamelus), sometimes called nilgau, is the largest Asian antelope. It is one of the most commonly seen wild animals of central and northern India, often seen in farmland or scrub forest. The mature male appears ox-like and is also known as the blue bull. A blue bull is called a nil gai or nilgai in India, from nil meaning blue and gai meaning a bovine animal (literally 'cow'). It is also present in parts of southern Nepal and eastern Pakistan. The species has become extinct in Bangladesh. It was known as the nilghor during the rule of Aurangzeb in the Mughal era. It is the only member of genus Boselaphus.

The Keoladeo National Park or Keoladeo Ghana National Park formerly known as the Bharatpur Bird Sanctuary in Bharatpur, Rajasthan, India is a famous avifauna sanctuary that plays host to thousands of birds especially during the summer season. Over 230 species of birds are known to have made the National Park their home. It is also a major tourist centre with scores of ornithologists arriving here in the hibernal season. It was declared a protected sanctuary in 1971. It is also a declared World Heritage Site.

Keoladeo Ghana National Park is a man-made and man-managed wetland and one of the national parks of India. The reserve protects Bharatpur from frequent floods, provides grazing grounds for village cattle and earlier was primarily used as a waterfowl hunting ground. The 29 km2 (11 sq mi) reserve is locally known as Ghana, and is a mosaic of dry grasslands, woodlands, woodland swamps, and wetlands. These diverse habitats are home to 366 bird species, 379 floral species, 50 species of fish, 13 species of snakes, 5 species of lizards, 7 amphibian species,7 turtle species, and a variety of other invertebrates. Every year thousands of migratory waterfowl visit the park for wintering breeding etc. The Sanctuary is one of the richest bird areas in the world. It is known for nesting of its resident birds and visiting migratory birds including water birds. The rare Siberian cranes used to winter in this park but this central population of Siberian Cranes is now extinct. According to Sir Peter Scott Keoladeo Sanctuary is the world's best bird area.

Source: Wikipedia

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