The Tigers of Sundarbans might be the most unique. The Sundarbans is home to extensive mangrove forest. The Sundarbans ecosystem is part of the Ganges delta.
The tigers of Sundarbans have an unique identity. They not only dominate the terrestrial region but also the waters.
So the Sundarbans tigers are not released on land but in water. The release boats are specially designed for the tigers. Incorporated with cages and safety mechanisms. Here the tiger is heard roaring just before the release.