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Common Loons: Egg-laying & Incubation

7-1-14  Loons #2 - incubating 404Typically Common Loons lay two eggs, each of which is roughly four inches long and olive green to brown in color, with brown or black splotches. The eggs are laid one to three days apart with the 28-day incubation period beginning when both eggs have been laid. Both parents incubate, turning the eggs when they switch places or during long periods of incubation. If the loon on the nest is anxious for relief, it will give a “wail” call, and if its mate does not respond, it continues wailing, even after leaving the nest to find its mate.

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4 responses

  1. Penny March

    Do loons have a central incubation patch or one on each side like puffins?

    July 1, 2014 at 2:14 pm

    • Penny March

      Found this info online…Incubation patch

      None, but there is extensive subcutaneous vascularization in posterior abdominal region of both sexes during incubation (JFB). Eggs are incubated beneath this region, and between feet, which may also contribute heat.

      July 2, 2014 at 2:53 pm

      • Thanks, Penny. Getting ready to go away for a few days — sorry I missed your question!

        July 2, 2014 at 2:57 pm

  2. The eggs look like stones, good camouflage! Have a great weekend!

    July 3, 2014 at 1:46 am

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