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2006 Peregrine Falcon Survey Results

Peregrine falcon in a wild eyrieSince the peregrine falcon was removed from the Federal Endangered Species List, the US Fish and Wildlife Survey has been conducting a post-delisting monitoring survey every three years of a sample of known territories across the country, to assess whether delisting is having a negative effect on peregrines. SCPBRG coordinates the effort for California, monitoring 34 survey eyries. We ask individuals, both private and agency, including SCPBRG personnel, to monitor survey sites in their area to a standard protocol, and report results to us. Thirty-four individuals provided data for the survey this season, which was then shared with USFWS.

We took the opportunity of 2006 being a survey year to also attempt to visit as many other known and suspected peregrine territories in California as possible. No statewide survey has taken place since 1992, when the last multi-agency survey documented 113 pairs in the state. We picked a difficult year for this effort, not planning on record amounts of rain and snow into the late spring, and very high fuel prices. A grant from Newman's Own helped us fund the effort. Over 60 public and private individuals participated in the survey, many at their own expense of time and travel. We appreciate the effort of each one of them.

Some sites were not accessible until July due to snow on the ground. To date, 271 sites in California have been identified as having an active breeding pair at least once since the recovery began in the 1970s. 236 known or suspected sites were visited this year, and 215 provided some useful data. 167 sites had at least one adult present, and 154 had a confirmed active pair. Nearly 30 sites were newly discovered, or reported to us for the first time by individuals who have known of them for some time. The average fledge rate at successful nests was approximately 2 young per pair, with a minimum total of 146 young produced. Since we know many territories were not visited during the nestling stage, far more young peregrines fledged in the state this year. Our focus was not productivity, but a census of pairs.

Unusual eyries this season included two in abandoned stick nests on transmission towers in the San Francisco Bay Area, one on a small dike in a saltworks, and two in old-growth snags above a forest. With the absence of widespread decimating contamination, and remarkable adaptability, it's becoming difficult to know where to look for peregrines!

Again we thank every individual who participated in this year's survey efforts.

  • Allison, Brian
  • Anderson, Steve
  • Andreano, Paul
  • Aulman, Lee
  • Baird, Mike
  • Ball, Cathy
  • Bell, Doug
  • Bennet, Joe
  • Bogener, Dave
  • Boyd, John
  • Cottrell, Kanit
  • Davis, Jeff
  • Derby, Debbie
  • Dexter, Ken
  • Duffy, Vince
  • Dunlop, Nick
  • Eakle, Wade
  • Estes, Don
  • Francis, Scott
  • Garrison, Dennis
  • Gist, Jessica
  • Grant, Grant
  • Gregoire, David
  • Guliasi, Gary
  • Hamm, Kieth
  • Haschak, Art
  • Himmelwright, Craig
  • Holm, Greg
  • Hunt, Terry
  • Keiffer, Bob
  • Kirven, Monte
  • Latta, Brian
  • Linthicum, Janet
  • Lish, Cheryl
  • Loewen, Evet
  • Martin, Ryan
  • Maurer, Jeff
  • Menzel, Sandra
  • Morse, Neil
  • Nelson, Laura
  • Neville, Glenn
  • Oliveri, Joe
  • Pagel, Jeep
  • Rich, Adam
  • Robertson, Mark
  • Rowlette, Richard
  • Schubert, Steve
  • Sipple, Jeff
  • Smith, Zack
  • Sooter, Will
  • Sorenson, Kelly
  • Stewart, Glenn
  • Stirling, Susan
  • Suddjian, David
  • Sullivan, Judy
  • Tallerico, Karla
  • Thompson, Steve
  • Todd, Nick
  • Watt, Mary
  • Weygandt, Clara
  • Yasuda, Susan
  • Young, Paul