Nest #6741

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.

Previous Next

	2017 - Butterflygirl	2016 - Butterflygirl
aAdult Arrival	3/21/17	3/21/17
aOccupied	Yes	Yes
aActive
bEgg Laying	4/11/17	4/11/17
bIncubation Initiation	4/12/17	4/12/17
cClutch Hatching
dNestlings
eFledglings
eFirst Chick Fledging
fChicks Last Observed
xNest Failure
xReason For Nest Failure

Adult arrival	03/21/2017	Nestlings
Nest Occupied	Yes	Fledglings
Nest Active		First chick fledging
Egg laying	04/11/2017	Chicks last observed
Incubation initiation	04/12/2017	Nest failure
Clutch hatching		Reason for nest failure

Adult arrival	03/21/2017	Nestlings
Nest Occupied	Yes	Fledglings
Nest Active		First chick fledging
Egg laying	04/11/2017	Chicks last observed
Incubation initiation	04/12/2017	Nest failure
Clutch hatching		Reason for nest failure

Photos of this nest

Nesting Diaries

05/26/2017 by Butterflygirl

First egg on nest seen by Ferry staff.

05/25/2017 by Butterflygirl

Female on nest again.

05/17/2017 by Butterflygirl

Have observed a pair around the nest together but they have not started to sit on it again yet.

05/03/2017 by Butterflygirl

Another pair of ospreys seen antagonizing female on nest. Fight ensued. Eggs destroyed by second pair of ospreys. Gulls ate/picked shells out of the nest.

05/02/2017 by Butterflygirl

Two eggs observed on nest by Ferry personnel.

04/12/2017 by Butterflygirl

This is a very interesting nest. It is on a pylon that the ferry comes up against multiple times a day. The adults would be on and off nest as ferry came and went. They would perch on a taller pylon when ferry near. (See picture). Tonight, an egg was observed by the ferry Captain and Oiler from the wheelhouse of boat. Female flew off but circled back and was back on egg immediately.