The American Giant Runt is a breed of pigeon developed by selective breeding primarily as a utility and exhibition breed. American Giant Runts, along with other varieties of domesticated pigeons, are all descendants from the Rock Pigeon (Columba livia).The breed is known for large size and suitability for squab production.
Origin: The American Giant Runt was developed by crossing the original Runt with several other varieties. The American Giant Runt was the result of USA breeders seeking a shorter, typier bird. A related breed is the American Giant Rumbler which is a further development. Both varieties are recognized in the USA.
Source: Wiki