A horned kangaroo is presumably a mutated version of the kangaroo, an Australian marsupial. It is not certain how they ended up in North America - they might have escaped from a zoo.
Quotes
- "You think these might be Horned Kangaroo bones, but you cannot be sure. They are too weathered to make a final determination."
Appearances
The remains of a horned kangaroo appears in Fallout and Fallout 2.
Behind the scenes
The horned kangaroo is likely a reference to Mad Max 2, since you can see kangaroo bones in this movie.