Radstags
If it's possible for radiation to take something amazing and not make it terrible, I haven't seen it yet. The deer was once a symbol of majesty, nobility, and integrity. Now it's an anxious, flighty animal, that more often than not will completely flee from conflict. The Deer of the Back-When Times were majestic animals, with a glossy brown coat of fur and elegant antlers. Now, the Radstag is two-headed, (one noticeable smaller than the other), with 6 leges, two of which are malformed and diminutive, covered in patchy, ragged grayish-red fur and its antlers are broken and twisted.
A pathetic creature, the Radstag will avoid conflict, unless provoked. Then it will attempt to gore you with its horns, usually failing. A timid creature, Radstags are too panicky to be properly domesticated. Instead, they are hunted for their horns, meat, and hide. Radstags will live in herds of about 5 members: an adult male, two females (referred to as Raddoe), and three yearlings. The lone Radstag male will occasional be found roaming the Wastes for a female to begin their own herds with. Occasionally, you will come across two males fighting for a Doe's attention. The Stags will fight by locking their horns and trying to overpower each other. The weakened loser will make easy prey. Or, you could just kill all three of them, it wouldn't be that hard.
Radstags Trivia
Radstags will shed their antlers during certain times of the year
Predators include: anything that is not either a Brahmin or a Radroach, as stated earlier, the Radstag is pretty pathetic.
There are rumors of a Radstag that glows blue from drinking Nuka-Cola Quantum, this sounds pretty stupid, but stupider things have happened because of Nuka-Cola.
Radstags are stupid, that is all.