Trumpeter swan the park which have not mated in years. Scientists attribute the loss in the park's population to the loss of nests and nesting sites because of spring flooding caused by climate change. Trumpeter swan The trumpeter swan ("Cygnus buccinator") is a species of swan found in North America. The heaviest living bird native to North America, it is also the largest extant species of waterfowl with a wingspan that may exceed . It is the American counterpart and a close relative of the whooper swan ("Cygnus cygnus") of Eurasia, and even has been considered the same species by some authorities.
Grey-winged trumpeter subspecies of the pale-winged trumpeter, actually is closer to the grey-winged trumpeter. The grey-winged trumpeter is a dumpy, guineafowl-like bird with a long neck and legs, and short yellow chicken-like bill. It is long and in weight. The soft plumage is mainly black, but the feathers of the inner wing are grey. These are gregarious forest birds which nest in hollow trees, laying 3-4 white eggs that are incubated by all members of a group of five or more birds. When not breeding, the flocks may number 50 or more. Their food is insects and fruit, picked off the ground.