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.
30-minute observation period mid-afternoon. One osprey low in nest. Head visible at times. Another osprey flew into the area. This second osprey flew around the nest in a wide circle, making smaller loops at times. Then flew off toward the south.
10:00 am Two osprey in nest. One flew away as I approached. The other sat quietly make a little chip sound. This behavior was repeated a half hour later when I passed by their nest again on the sidewalk below. When I turned to look back after I passed the nest, I saw an osprey leaving the nest (probably the second one, leaving the nest empty).
7:44 One osprey camera shy again and left nest.
8:56 Two osprey in the nest left before I could get a good picture. They really are spooked by people. I did take a picture of their nest though because there was definitely a large addition sticking up on the right side.
3/31/2020 12:57. I saw the head of one osprey in the nest, but as I approached it left the area quickly and the photo I did manage to take didn't show much detail because of the distance. This behavior reminds me of last year, when the Osprey in that nest were very nervous about people standing around trying to take their picture and would often leave.