Nest #6210

Adult Arrival

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.

Incubation Initiation

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.

Clutch Hatching

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.

Nestling Count

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

Fledgling Count

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.

Nest Failure

Look for signs of nest failure like adult abandonment, adults no longer incubating eggs or feeding young.

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Activity reports

Adult arrival	03/21/2016	Nestlings
Nest Occupied	Yes	Fledglings
Nest Active		First chick fledging
Egg laying		Chicks last observed
Incubation initiation		Nest failure
Clutch hatching		Reason for nest failure

2016 Nest Activity Report by CBEC

Adult arrival		Nestlings
Nest Occupied	Yes	Fledglings
Nest Active		First chick fledging
Egg laying		Chicks last observed
Incubation initiation		Nest failure	06/12/2016
Clutch hatching		Reason for nest failure	On June 12 we saw no sign of either parent for several hours. Upon investigation we saw an amputated squirrel tail and the wing of a bird near the nest as well as an unhatched egg that had holes pecked in it. Nest was empty.

Photos of this nest

Nesting Diaries

04/01/2016 by BayBridge

Patty arrived 3/17 (hence the name Patty) and Bert arrived 3/21. The first few days they did not spend time together and would go somewhere else at night. Beginning about 3/28/16 the started spending time in the nest together and stayed all night. On 3/31/16 Patty started sitting, seems to have made a hollow among the sticks and only her head is showing. However, have not observed any nest repair or mating activity - maybe she is just practicing! There is another osprey that comes by every few days but Patty and Bert chase him/her away. now they

	2016 - CBEC	2016 - BayBridge
aAdult Arrival		3/21/16
aOccupied	Yes	Yes
aActive
bEgg Laying
bIncubation Initiation
cClutch Hatching
dNestlings
eFledglings
eFirst Chick Fledging
fChicks Last Observed
xNest Failure	6/12/16
xReason For Nest Failure	other