This bird has a blue neck but its not a Nilkanth, but a male peacock

The Indian Peafowl or Blue Peafowl (Pavo cristatus) is a large and brightly coloured bird of the pheasant family native to South Asia, but introduced and semi-feral in many other parts of the world. The male, peacock, is predominantly blue with a fan-like crest of spatula-tipped wire-like feathers and is best known for the long train made up of elongated upper-tail covert feathers which bear colourful eyespots. These stiff and elongated feathers are raised into a fan and quivered in a display during courtship. The female lacks the train, has a greenish lower neck and has a duller brown plumage. They are found mainly on the ground in open forest or cultivation where they forage for berries, grains but will also prey on snakes, lizards, and small rodents. Their loud calls make them easy to detect, and in forest areas, often indicate the presence of a predator such as a tiger. They forage on the ground, moving in small groups and will usually try to escape on foot through undergrowth and avoid flying. They will fly up into tall trees to roost, however. It is the national bird of India.

Source: Wikipedia

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