Are critically endangered Great Indian Bustards now migrating to Pakistan?

Environmental activists suggest the birds, one of India’s most critically endangered species, may have migrated due to their shrinking habitat in Desert National Park

from The Hindu - World https://www.thehindu.com/sci-tech/energy-and-environment/are-critically-endangered-great-indian-bustards-now-migrating-to-pakistan/article66040102.ece