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San Jose Nest Diary 2012:

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May 17: The first male, known as “Cobalt,” fledged today at 39 days of age. He left the ledge at about 8:30 pm, or in the last light of the day. He made a good landing on the louvers about one third of the way down the building and stayed there for the night. We usually look for the males to fledge at about 41 days of age and the females on day 43 or 44.  While there was some excitement, this year all of the young survived fledging and could be seen in the vicinity of City Hall for a month or more.

May 1: BANDING: Three males and one female were banded today at San Jose City Hall.

April 17: The chicks have achieved a second coat of down which protects them from the cold while both parents are hunting birds to satisfy their voracious appetites. Please do not be alarmed when the youngsters are not brooded for what seem to be long periods of time. They can take it—Peregrine Falcons live and raise young in the Arctic. One other cautionary note: It is typical for one or two young to receive more food than one or two of the others at any given feeding. Knowing that, when we see one youngster who does not seem to be eating much, it is probably because he or she ate heartily just a few hours ago and is not yet hungry. To our eyes, it seems like it is the “one in the back” who is not being fed. But in fact, it is the “one who ate most at the last meal” that is now in the back dozing.

April 8 & 9: Hatching! All four eggs hatch. Food deliveries by Fernando begin and all babies appear to be doing fine.

March 20: The new tiercel has been named “Fernando Cohete” and has become established as the new territorial male. He has begun to share incubation duties with Clara over the past few days. The former tierce, “EC,” has been seen several times perching on the Joe West dormitory building on the campus of California State University San Jose less than one-half mile from City Hall. He has not attempted to return to the nest ledge.

New TiercelMarch 5: Clara’s 4th egg arrived early this morning in the midst of an apparent changing of the guard—a new tiercel (male falcon) arrived in the territory yesterday and drove off the resident male known as “E.C.” The new tiercel is delivering food to Clara and engaging in other courtship activity. Given the level of activity, we do not think that hard incubation began with egg number 3 but has been deferred to begin with the arrival of egg number four.

February 26: The first egg arrived today. Egg-laying will continue at intervals of about 56 hours until a full clutch—usually 4 eggs—is achieved.