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.
Observer Rita K. reports: This nest is high up on a tower, and my view from across the street is angled up under the nest. I can’t see inside the nest. I went over June 24 and again July 7, but didn’t see any ospreys at all perched or flying around the nest. There had been two ospreys on duty a month ago.
JUNE 7, 2018 OBSERVATION: TWO OSPREYS FLYING AROUND THE TOWER AT THE LEVEL OF THE NEST. ONE WAS AGITATED AND CHIRPING RAPIDLY. I will try to observe at a different time of the day. I'm sure there are chick(s) in the nest.
observer reports: On April 20, 2018 Joe and I observed one male osprey in the air circling the tower. Then he alighted on the nest's edge. The female poked her head up. She may have been sitting on an egg.