Trumpeter swan which is apparent even when the swan is not standing or swimming upright) and larger, wedge-shaped bill as compared to the tundra swan. Trumpeter swans have similar calls to whooper swans and Bewick's swans. They are loud and somewhat musical creatures, with their cry sounding similar to a trumpet, which gave the bird its name. Beginning in 1968, repeated in 1975, and then conducted at 5-year intervals, a cooperative pan-continental survey of trumpeter swans was last conducted in 2015. The survey assesses trumpeter swan abundance and productivity throughout the entire breeding ranges of the three recognized North American populations: the
Trumpeter clock were very simple in design, producing a simple bugle call that is reproduced once for each hour. In the later years the musical abilities of the clocks greatly improved, and many examples were made to produce complex musical tunes. Although many different makers made the trumpeter clocks, Emilian Wehrle was without question the undisputed leader of trumpeter clock production and design. A trumpeter clock can be found in several different variations. The most common examples are known to collectors as a "blowers" or "German buglers". These examples use a modified cuckoo type movement that produces a simple trumpet like call.