In addition to the well-known mexican feathered amphithere, there is a furry North American variety that primarily hunts buffalo and has sometimes been mistaken for a gigantic moth.
Lair or Nest:
Among the reeds on lakesides or offshore islands.
Dimensions:
[Adult] 45 feet long; 5-10 feet high
Colouration:
Green
Forms of Attack:
Flaming breath, tail lash, constriction.
Food:
All the large indigenous mammals of the Americas, typically llamas in the south and buffaloes in the north.