This is the third year for this nest. Last year they fledged four young at the beginning of September.
What to look for
Look for 2 adults on the nest. The adult pair will show pair bonding behaviors such as vocalizations, aerial sky dances, and the male feeding the female fish. You may see the pair copulating, which typically begins 14 days before laying eggs.
Females will lay 1 - 4 eggs at a rate of one egg every 1 - 2 days. After laying, incubation starts. Look for adults taking turns sitting low in the nest incubating eggs. The incubation period can last 35 - 43 days.
Chicks hatch ~39 days after incubation begins. Look for adults bringing food to the nest and making "head bows" into the center. Chicks typically can't be seen until they are 2 - 3 weeks old, so feeding behavior is the only way to know chicks are there.
Around 4 weeks after hatching, look for the heads of chicks to show over the rim of the nest, particularly when adults bring food to the nest. Other times they lie flat and are harder to see. Count the number of chicks in the nest before they learn to fly
Chicks begin flying around 7 - 8 weeks old, and are still fed by the adults. Count the number of chicks who have successfully fledged the nest and are observed flying.
Chick Last Observed
4 - 10 weeks after fledging, chicks begin leaving the nest area to migrate south, once they have learned to fly and feed themselves. Record the date that the last chick left the nest.
Look for signs of nest failure like adult abandonment, adults no longer incubating eggs or feeding young.
4/24/18 This pair is rebuilding on a site that was active for many years, then they moved across the small bay to another site. The nest was then blown down over winter.
It appears they have returned to the old site with a new nest.
5/14/18 One adult low in nest, possibly incubating.
This nest had been blown away and site unused for the past three seasons. On April 11, 2016, two birds were at the nest arranging new materials. While I observed, one flew to the lake's edge and returned to the nest with both talons carrying moss.
The nest on this structure had fallen a couple of years ago, and I suspect the pair built what has been listed as Nest #1465 as a replacement. But, today a pair was observed at this site and have started rebuilding a nest on the same structure. SO, IS THIS A NEW NEST? Also, a single bird was observed perched by #1465. Will have to sort this ut later.
07/18/12 Although this nest hasbeen reported as abandoned, I observe it as I also see the new nest #1465. Three adults were flying in the area, and one landed on the abandoned nest and stayed on the edge for about five minutes. Nostalgia, perhaps?
6/14/12 Made two observations two hours apart. First, at 1030, no activity at the nest although on 5/29 one was in the incubating posture. However, two adults were in the "perch" tree about 200 years away, close together, with one eating a fish, and the other preening. Two hours later, 1230, no activity at or near the nest.
4/19 Both adults bringing nesting materials to site. 4/20 Same, with one bringing large sticks, the other with mosses. 5/08 Incubating posture. 5/13 incubating posture, other bringing fish to nest. 5/29 Incubating postue, other near site.