Common Loons prefer nesting on islands (versus the mainland) and typically their nest is adjacent to water that is deep enough for an underwater approach. Males usually choose the nest site, and return to it year after year if they have reproductive success there. Both male and female loons construct the nest, using vegetation growing adjacent to or on the bottom of the pond near the nest site. It takes them about a week to build their nest and they add continuously to it throughout incubation.
Usually two eggs are laid, occasionally one, and both parents incubate the eggs. Incubation lasts 26 – 29 days. Just prior to hatching you can hear the chicks peeping inside the egg before they cut through the membrane and outer shell with their “egg tooth,” extract themselves from the egg, dry their down and enter the water. They are born knowing how to swim.
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