Trumpeter swan is one the heaviest flying bird species in the world. Adults usually measure 138–165 cm (4 ft 6 in–5 ft 5 in) long, though large males can exceed 180 cm (5 ft 11 in) in total length. The weight of adult birds is typically 7–13.6 kg (15–30 lb). They are native to North America. They also have a very large wingspan, which can exceed 3 meters (10 feet).
At one point in the history, the trumpeter swan was dragged to near extinction: in the 19th and early 20th centuries, they were hunted heavily. By 1933, fewer than 70 wild trumpeters were known to exist in remote hot springs in or near Yellowstone National Park, and the extinction seemed inevitable. But during an aerial survey of Alaska’s Copper River in the 1950s, several thousand trumpeters were discovered. This population provided critical genetic stock and with careful reintroductions by wildlife agencies, the Trumpeter Swan Society population gradually increased to over 46,000 birds by 2010. Photo: whyevolutionistrue.wordpress.com