The gazelle is the mutated version of the pre-War animal of the same name. After two centuries of exposure to radiation, the gazelle has mutated and grown one additional head and two additional legs, similar to radstags at the base of the lefthand head's neck. The legs are too short to touch the ground, thus making them useless to the animal.
The gazelle is usually found in a small herd of three to four rather than being alone. They can be found eating grass outside the Nuka-world park. They will run away as soon as they detect an enemy. It rarely attacks but instead uses its four legs to make a quick escape.
Mutated gazelles are found roaming around Nuka-World, particularly the Safari Adventure zone. They have grown an extra pair of legs in the front, and a second head.
Found in the Bradberton Amphitheater, with identical behavior and responses as a standard gazelle. The only difference from the regular gazelles is that they are owned by the Pack.
Turning the cloning machine in the Welcome Center back on after the quest Safari Adventure will spawn more gazelles around the park, especially in the Safari Adventure zone.
They will only attack the Sole Survivor if their legs are crippled and they are in melee range.
Killing these creatures do not count towards the achievement All Sugared Up.