Hello my friend,after i saw the picture of the birds you shared i decided to do a quick search to have an idea about the bird so i found these...the bird is referred to as The black-necked stork

"The black-necked stork is a tall long-necked wading bird in the stork family. It is a resident species across the Indian Subcontinent and Southeast Asia with a disjunct population in Australia" @failingforwards