Peregrine Falcon

Falco peregrinus

Order:
Falconiformes
Family:
Falconidae
Sections

Tables and Appendices

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Appendix 1

Annual reproductive success (young/territorial pair) of selected North American Peregrine Falcon populations.

LocaleYearsNumber of pair-yearsPercentage successfulNumber of young fledged/pairSource(1)
Ne. U.S.1985–1996226621.32A
Midwestern U.S.1982–2000813651.80B
Colorado1972–1984122130.26C
California1975–19921,046-1.10D
Langara I., British Columbia1980–198961842.31E
Rankin Inlet, Nunavut1982–199533054about 1.27F
Ungava, Quebec1980–198554902.53G
W. Greenland1972–1985193822.30H
Mackenzie River valley1969–1985198771.87I
Colville River, AK1975–1992188571.57J
Yukon River, AK1978–1985170782.10K

  • (1)Sources: A = Corser et al. 1999, recalculated from Table 1; B = Tordoff et al. 2000; C = Craig et al. 1988b; D = Linthicum and Walton 1992; E = Nelson 1990; F = Estimated from Johnstone 1998, Table 4.1; G = Bird and Weaver, Table 2 in Cade et al. 1988; H = Mattox and Seegar 1988; I = Bromley and Matthews 1988; no data for 1976 and 1982; J = Ambrose et al. 1988; K = Ambrose et al. 1988.

Appendix 2

Appendix. 2. Geographical and sexual variation in measurements (mm) of adult Peregrine Falcon subspecies. Data shown as mean ± SD (range). Immatures average about 1% longer wing by sex, 4% longer tail in females, and 5% longer tail in males (n = 523). F. p. peregrinus and F. p. brookei are among those released in e. U.S. during reintroduction to indicate range of measurements. See Systematics: subspecies.

Subspecies and subgroupWing-chordTailTarsusToe without clawCulmen from cere
F. p. anatum(east) (1),(5)
   Male (n = 13)315.5 ± 5.04 (308–332)147.2 ± 7.04 (131–155)45.8 ± 2.5 (43–52)49.2 ± 1.81 (46–52)19.4 ± 0.09 (18–21)
   Female (n = 28)357.6 ± 4.72 (340–372)179.2 ± 8.78 (165–185)50.7 ± 3.67 (45–59)54.6 ± 1.53 (51–58)23.9 ± 1.24 (22–27)
F. p. anatum(west) (2),(5)
   Male (n = 36)306.0 ± 3.90 (291–318)142.6 ± 6.12 (130–155)45.8 ± 2.60 (42–50)47.3 ± 1.65 (43–52)19.8 ± 0.09 (18–22)
   Female (n = 45)349.8 ± 5.80 (333–363)170.3 ± 6.62 (160–187)51.4 ± 3.61 (44–58)53.2 ± 2.04 (48–59)23.9 ± 0.02 (20–25)
F. p. pealei(5)
   Male (n = 32)318.6 ± 5.17 (305–334)151.5 ± 5.78 (143–162)49.1 ± 2.22 (45–53)49.1 ± 1.15 (47–51)20.1 ± 1.36 (17–22)
   Female (n = 27)363.9 ± 5.84 (347–375)179.6 ± 4.50 (172–194)54.7 ± 2.01 (50–62)55.1 ± 1.48 (52–57)24.4 ± 1.01 (23–27)
F. p. tundrius(5)
   Male (n = 82)308.3 ± 4.74 (292–330)140.2 ± 4.94 (130–154)44.4 ± 2.52 0 (40–5)46.2 ± 1.35 (42–48)18.8 ± 0.04 (17–21)
   Female (n = 81)342.4 ± 6.42 (333–368)168.6 ± 5.56 (153–180)49.9 ± 3.33 (42–57)52.2 ± 1.80 (49–56)22.8 ± 0.30 (21–25)
F. p. peregrinus(3)
   Male (n = 14–20)309 ± 7.55 (291–320)144 ± 5.31 (134–156)46.9 ± 1.06 (45–49)47.2 ± 1.25 (44–49)20.0 ± 1.03 (18–23)
   Female (n = 16–23)356 ± 6.76 (348–367)173 ± 4.29 (163–180)53.5 ± 1.51 (51–56)53.7 ± 2.00 (50–57)24.0 ± 0.91 (22–26)
F. p. brookei(4)
   Male (n = 12–18)285 ± 10.39 (268–310)125 ± 6.14 (114–136)46.2 ± 2.90 (42–48)45.8 ± 1.48 (43–49)20.1 ± 1.26 (18–24)
   Female (n = 10–15)325 ± 6.26 (319–340)149 ± 6.06 (138–157)48.0 ± 2.03 (48–57)52.0 ± 1.74 (49–57)23.8 ± 0.86 (22–25)

  • (1)Population of falcons extirpated by synthetic chemicals and into whose geographic range others were reintroduced (see Conservation and management).(2)Predecline population existing more or less west of 100th meridian; other falcons were reintroduced into a residual of predecline individuals (see Conservation and management). (3)Stock from Scotland used in reintroduction in e. U.S. Data from Cramp and Simmons 1980a. About average of American stocks.(4)Stock from Spain used in reintroduction in e. U.S. Data from museum specimens. Smaller than American stocks.(5)Data from White 1968a, White 1968b.

Recommended Citation

White, C. M., N. J. Clum, T. J. Cade, and W. G. Hunt (2002). Peregrine Falcon (Falco peregrinus), version 2.0. In The Birds of North America (A. F. Poole and F. B. Gill, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bna.660