This week San Francisco happily welcomed four new peregrine falcons into the city. This morning the fourth egg hatched and we have a happy family of six. The parents (Dan and Cher) have been sharing the duties of nesting and providing food for the little ones. Thanks to a “FalconCam” installed by The Santa Cruz Predatory Bird Research Group, the live events of hatchings, feedings, and hours upon hours of nesting and brooding are accessible to the public on UCSC Research Group’s website: http://www2.ucsc.edu/scpbrg/nestcamSF.htm.
Video clips are also published on YouTube, and this morning’s video features Papa Dan nesting with the newborns when Mama Cher arrives (around minute 5:40) and proceeds with the feeding:
The peregrines nest on the 33rd floor roof on the PG & E building in downtown San Francisco:
The nesting box was provided by the UCSC research group to encourage nesting by local peregrines hunting in the region. The UCSC group was pivotal in the recovery of the western Peregrine Falcon population which had neared extinction due to the downstream effects of DDT on eggshells, causing them to thin and weaken preventing successful brooding. In the 1970s there were just 2 pairs of Peregrines known to exist in California, and apparently no nesting pairs east of the Mississippi. Due to recovery attempts, there are an estimated 250 pairs of nesting Peregrines in California and the populations throughout the U.S. have recovered enough that the species was removed from the Federally endangered list in 1999.
According to expert sources (http://www.dec.ny.gov/animals/7290.html) the newly hatched chicks or eyases (eyas, singular, for a nestling falcon or hawk) don’t feed for the first 24 hours, as it seems they spend so much energy getting out of the egg shell they spend the first day resting and recovering from that process. Until about 10 days in age the newly hatched chicks require constant brooding as they don’t have enough down to keep themselves warm. After they build up their coat of feathers they require less brooding but more food. Parents Dan and Cher will be spending a lot of time hunting to feed their babies.
After about 5 weeks, the eyases have grown into juveniles with mature plumage and start the process of learning to fly. I’m already a bit nervous for the little ones learning to fly from such great heights, but am excited to be able to watch it all from the FalconCam!
These are magnificent birds that provide our cities with a much needed top-level predator to help keep curtail populations of the Rock Pigeon- the introduced, escaped, and now overly common population of bird filling many of our cities. I must remember to keep my eye on the sky when in downtown SF and hopefully someday will catch a glimpse of one of these beauties in flight.