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.
3/06/21 Female arrives at site.
3/10/21 Ma;le apparently attempts to mate with female, but rebuffed by her. Male had two silver bands which were unreadable from image.
3/13/21 Preferred male No ;eg bands) and female on the nest for the first time. Nest showed evidence of having been worked on which it didn't have yesterday.
First observed solitary females off and on for several days before verifying that one was nesting. One on box this date was attacked by another female and a fight ensued. I left before any bird returned to the nest.
3/11/2013-A lone male was on the platform in the morning. He took off carrying a fish, hovering in mid air while calling. He returned five minutes later and alit on a nearby channel marker. Shortly, a female came on the scene and the male flew to the platform and was joined by the female. Within a few minutes, a third bird came on the scene and the two on the platform crouch down with wings spread, apparently trying to keep the other osprey off, That osprey continued on its way out of the area. The pair then took off. No ospreys were around the site later this afternoon.
This is the third failure at this site in three years. In 2011, thenest was abandoned after the male disappeared. There were no hatchlings visible. In2010, the nest failled with the death of the femaile. Two fledglings were found dead in the nest from exposure.