This is about the eighth year. Fledged one young late August, 2011.
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.
04/08/20 I was able to get in to observe this nest through significant snow depth in the area. Much of the nest has blown off the platform over the winter, but two adults were in the nest when I arrived, then both flew to their normal perch tree next to the nest structure.
6/29/17 Two adults in nest, one just arrived with fish, other low in nest, turning eggs.
7/11/17 One in nest, attending at least one chick. Cannot see into nest. Other adult flew to the lake shore and spent 5 minutes bathing. Temps 90 degrees.
7/19/17 Two adults at nest, one feeding one or two young.
7/31/17 Two adults at nest, one moved to the perch tree nearby, other feeding one or two chicks.
This nest wasn't accessible until 5//2/17 due to deep snow. This nest was mostly destroyed by winds over the winter. On 5/2/17 the pair was observed rebuilding the nest with frequent trips carrying sticks to the platform. On 6/2/17 one adult was incubating, and the other just brought a fish to the nest.
06/27/14 Two adults at nest. One hour later,one adult left nest, circled area, stooped on raven flying by and drove it to the ground.
07/15/14 One adult with fish near nest, one adult on edge of nest, very hot, 98 F. Possible two young in nest.
07/23/14 Very, very windy, no birds seen at nest, probably hunkered down.
07/29/14 Two fully grown young on edge of nest.
06/12/14 Very, very windy. The worst I've seen at Lake Davis. One bird low in the nest, then up looking around. About then three birds were circling the area for about five minutes. One broke off and landed at the nest, greeted by the one already present. The other two circled for another two minutes, then slipped away on the favorable wind.
04/08/14 This nest built on a poorly designed artificial platform once again blew off during th winter. This date, however, there was one adult sitting on the nest platform.
04/28/14 Nest is being rbuilt, one perched by the nest.
05/12/14 Two at the nest, interactivity.
05/24/14 Two at the nest.
8/19/13 With over an hour's observation, no adults were seen in the area, and none on the nest. Over the season, this pair had been acting very strange, and I suspect they were just "playing house" as second-year birds may do. Nest appears abandoned.
8/13/13 At 1220 hours one adult (with heavy chest band) was perched on the edge of the nest. No young observed.At 1250 the other adult flew in without a fish, but joined the other on the nest edge. At this time, they chnged nest duties, the adult with the heavy chest band leaving and the very clear white chest one stayed. Just a minute after the one left, two Red-tailed Hawks appered soaring in the vicinity. Interestingly, the dark banded adult immediately returned at perched wwith its mate on the nest.
5/24/13 Perhaps this pair has sorted out who is who. Very active today, with one adult bringing in a stick every few minutes, then the pair would copulate on the low nest, then off again. They made six trips in 25 minutes, and the nest is actually coming along fine, compared to the start of the season.
There is a very strange story going on at this site.
04/03/13 Two adults at the nest site, stamding on the 2x4 boards serving a a base for the nest. All previous nest materials has been lost over the winter, which has happened before. To me, a poor sunstrate design.
04/11/13 There were a couple of sticks at the site, and one standing on the boards. Another showd up with a fish, ate it on the boards, then flew off and returned within a couple of minutes with a stick, as the other stayed in place on the bosrds.
04/18/13 Just after noon, and no new materials at the site. Four osprey were flying all aroiund the nest site, and occasionally one would land on the boards while the others flew around and did some aerial combat maneuvers. I have photos of one standing on the site as another came in with a fish and the bird on the site turned over as an eagle or hawk to fend off the other, at a point turning totally upside down. So who is who? Are the two "intruders" possibly young from a previous year? Stasy tuned!
04/25/13 1400 hours, no asctivity in the area. At 1515 hours, one was on the site, another approached with a fish, but then they copulated on the site, when once again another "intruder" appeared and chased off the pair.
05/02/13 At 1300 hours, no birds at the site. At1500 hours two birds were on thje site, but no new materials seemed to be appearing.