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.
a pair of Ospreys on this tree again with a "practice" nest of sticks. Defending the tree from other Ospreys attempting to land on the tree. This could be the same pair that has been nesting and attempting to nest at River Barge Park for the last several years.
Once again there were several birds on the tree. The owner of the nest was aggressive about chasing the others to the perimeters but seemed to have given up chasing them away. I couldn't see the female incubating today, but I hope she was in the nest.
This pair had built a new nest on an unused crane at a construction site a half mile away. It had to be disassembled. The Sports Authority folks and some volunteers constructed a nesting platform but so far no nest building there. Apparently they are trying the dead tree again and another pair is bringing sticks to an abandoned Redtail Hawk nest near by.
Stopped by this morning and the pair was in the tree, but no nest. I found out that the platform was only recently put there hoping the pair would make a nest there. But so far they don't seem interested.
Apparently there was a nest in this tree last year, but it is gone now. However the pair was busy rebuilding it this morning. Ironically there is an Osprey platform a couple of hundred yards away that does have some sticks on it, but looks inactive.