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
Trumpeter hornbill storage (similar to the excessive iron storage seen in the disease hemochromatosis in humans). They are very intelligent and have a life expectancy of up to 20 years. Widespread throughout its large range, the trumpeter hornbill is evaluated as least concern on the IUCN Red List of Threatened Species. Trumpeter hornbill The trumpeter hornbill ("Bycanistes bucinator") is a medium-sized hornbill, with length between , characterized by a large grey casque on the bill, smaller in females. The eyes are brown or red, with pink surrounding skin. Body mass is between . It is similar to silvery-cheeked hornbill. Distinguishing features include