sounds are as mournful or memorable as the Common Loon's

Few bird sounds are as mournful or memorable as the Common Loon's yodel. Each yodel is specific to a male loon, but even among individuals this vocalization does not remain static: When Common Loons move to new territory, their yodel often changes with the landscape.

Yodeling, however, isn't the Common Loon's only claim to fame. They also produce a series of trembling laugh-like notes to sound the alarm or announce their arrival.