The Trumpeter Swan is the largest waterfowl species native to North America. The male is called a cob; the female is called a pen. Observers have described the Trumpeter’s call as resonant, deep and loud, sonorous and trumpet-like.
Hence the bird’s name: Trumpeter Swan. Most Trumpeters do not nest until they are four to six years old. Trumpeter Swans mate for life and may live for 20 to 30 years. Babies or cygnets hatch in June and weigh about 7 ounces. At early stages cygnets may gain 20% of their body weight every day. Cygnets are fully feathered by 10 weeks and can fly at 15 weeks.