A Common loon nest, made of matted grasses, rushes and twigs, is built near the water level. Loons prefer to nest on small islands or sheltered coves along the shore, and might even be found nesting on top of a muskrat mound.
Loons will usually lay one to three eggs, which are olive or brown with dark splotches. Both adults incubate the eggs for about 29 days. Upon hatching, chicks are active and covered with down, and will leave the nest within one day. They’re ready to fly about 75 days after hatching.