Trumpeter swan Hoopers; are the least." Early efforts to reintroduce this bird into other parts of its original range, and to introduce it elsewhere, have had modest success, as suitable habitats have dwindled and the released birds do not undertake migrations. More recently, the population in all three major population regions have shown sustained growth over the past thirty-year period. Data from the US Fish and Wildlife Service show 400% growth in that period, with signs of increasing growth rates over time. One impediment to the growth of the trumpeter swan population around the Great Lakes is the presence of a growing
Pale-winged trumpeter Pale-winged trumpeter The pale-winged trumpeter ("Psophia leucoptera"), also known as the white-winged trumpeter, is a species of bird in the family Psophiidae. It is found in the southwestern Amazon rainforest of Brazil, northern Bolivia, and eastern Peru. It has two subspecies: The widespread nominate has a white rump and is found south of the Amazon River and west of the Madeira River, while "ochroptera" has a yellowish rump and is found between the Amazon River and the lower Rio Negro. Genetic evidence suggests the closest relative of "ochroptera" is the grey-winged trumpeter, leading some to treat it as a separate