Both sexes also use a flat-toned, single-syllable “hoo” call to locate each other. There are three different types of swan which is the Trumpeter Swan, Mute Swan and Tundra Swan. Younger swans make a higher-pitched call, and develop their adult tone by the time they’re 6-8 months old. How does the swan defend itself? Louis’s father gives him a trumpet so that he can make trumpet-like sounds just like other swans do, to communicate and find a mate. Trumpeter Swans once nested over most of North America, but disappeared rapidly as civilization advanced westward; by the 1930s, fewer than 100 remained south of Canada. Swans have beaks and such to protect themselves, but they would normally fly away since they are not very good at self defense. In reality too, it is a fact that the trumpeter swan’s sound is deep, loud, and pleasant, which bears resemblance to a trumpet or French horn. Other Sounds A swan's neck is proportional to its body. There are three different types of swan which is the Trumpeter Swan, Mute Swan and Tundra Swan. Swans are very territorial and fierce creatures. Wiki User 06/18/2014. A swan's neck is proportional to its body. With protection from hunting and disturbance, populations have rebounded in parts of the northwest. If they feel threatened they will flap their wings and honk as a warning. Answer. Trumpeter Swans call to keep the pair or family together, to defend territories, or to sound an alarm. This may be the reason for the name ‘trumpeter swan’.