Brood size of Golden Eagles from studies across North America. The data used in this summary were only from study areas where data: a) were collected for at least three years, and b) brood size was documented when nestlings were at least 49 days of age.

Study area location

Lat/long, center study area

Study years

Years of study

 N broods

3-brood years^a

Pr. by brood size

Data source

1

2

3

Zacatecas, MX

22.9 N, 102.5W

2015 - 2017

3

10

0

0.75

0.25

0.00

L. Valdes-Alarcón, unpublished data

Baja California, MX

31.3 N, 115.3 W

2013 - 2015

3

22

0

0.65

0.35

0.00

4 de León-Girón, G., R. Rodríguez-Estrella, and G. Ruiz-Campos (2016). Current distribution status of Golden Eagle (Aquila chrysaetos) in Northwestern Baja California, Mexico. Revista Mexicana de Biodiversidad 87(4): 1328–1335. Close

AZ

34.4 N, 111.8 W

2015 - 2018

4

125

1

0.63

0.36

0.01

748 McCarty, K. M., K. L. Licence, and K. V. Jacobson (2015). Arizona golden eagle productivity assessment and nest survey 2015. Nongame and Endangered Wildlife Program Technical Report 300. Arizona Game and Fish Department, Phoenix, AZ, USA. Close , 749 McCarty, K. M., K. L. Licence, and K. V. Jacobson (2016). Arizona golden eagle productivity assessment 2016. Nongame and Endangered Wildlife Program Technical Report 307. Arizona Game and Fish Department, Phoenix, AZ, USA. Close , 750 McCarty, K. M., K. L. Licence, and K. V. Jacobson (2017). Arizona golden eagle productivity assessment and nest survey 2017. Nongame and Endangered Wildlife Program Technical Report 312. Arizona Game and Fish Department, Phoenix, AZ, USA. Close , 751 McCarty, K. M., K. L. Licence, and K. V. Jacobson (2018). Arizona golden eagle productivity assessment and nest survey 2018. Nongame and Endangered Wildlife Program Technical Report 322. Arizona Game and Fish Department, Phoenix, AZ, USA. Close

Northeastern NM

36.0 N, 104.2 W

2006 - 2009

4

86

0

0.67

0.33

0.00

Stahlecker, D. and B. Howe, unpublished data

Navajo Nation, U.S.

36.1 N, 109.2 W

1996-2005, 2010, -12, 2015 -16

14

408

4

0.72

0.27

0.01

Navajo Nation, unpublished data; 643 Stahlecker, D. W., Z. P. Wallace, D. G. Mikesic, and C. S. Smith (2017). Does Hopi religious harvest of eaglets affect Golden Eagle territory occupancy and reproduction on the Navajo Nation? Journal of Raptor Research 51: 305–318. Close ;

Jicarilla Nation, NM

36.5 N, 107.1 W

2002 - 2018

17

192

3

0.66

0.32

0.02

Jicarilla Nation, unpublished data

Diablo Range, CA

37.5 N, 121.7 W

1994 - 2000

7

184

3

0.53

0.45

0.02

421 Hunt, W. G, D. J. Wiens, P. R. Law, M. R. Fuller, T. L. Hunt, D. E. Driscoll, and R. E. Jackman (2017). Quantifying the demographic cost of human- related mortality to a raptor population. PLoS ONE12(2): e0172232. Close

Butte Valley, Siskiyou Country, CA

41.9 N, 122.0 W

1985- 97, 2014-16

16

180

1

0.19

0.80

0.01

Woodbridge, B., unpublished data

NE Panhandle, WW, northeast CO

42.6 N, 105.0 W

2014 - 2016

3

20

1

0.70

0.25

0.05

USFWS R6, D. Stahlecker, B. Smith, unpublished data;

Southwestern, ID

43.1 N, 115.9 W

1966 - 2012

47

1140

25

0.43

0.52

0.05

USGS, unpublished data

OR

43.9 N, 120.9 W

2011 - 2018

8

1187

6

0.62

0.36

0.02

Frank B. Isaacs, personal communication

Campbell & Converse Counties, WY

44.0 N, 105.7 W

1981 - 1985

5

331

3

0.54

0.44

0.02

436 Phillips, R. L., and A. E. Beske (1990). Distribution and abundance of Golden Eagles and other raptors in Campbell and Converse Counties, Wyoming. U.S. Deptartment of the Interior, Fish and Wildlife Service, Washington, DC, USA. Close

Yellowstone NP, WY

44.7 N, 110.3 W

2011 - 2018

8

40

0

0.85

0.15

0.00

USNPS, unpublished data

Southeastern MT, northern WY

44.9 N, 106.9 W

1975 - 1985

11

127

1

0.54

0.44

0.02

500 Phillips, R. L., A. H. Wheeler, J. M. Lockhart, T. P. McEneaney, and N. C. Forrester (1990). Nesting ecology of Golden Eagles and other raptors in southeastern Montana and northern Wyoming. U.S. Fish and Wildlife Service, Washington, DC, USA. Close

Livingston, Montana

45.7 N, 110.6 W

2010 - 2018

9

181

1

0.65

0.34

0.01

R. Crandall, unpublished data; 493 Crandall, R. H. (2013). Identifying environmental factors influencing Golden Eagle presence and reproductive success. M.S. thesis, University of Montana, Missoula, MT, USA. Close ); 752 Crandall, R. H., B. E. Bedrosian, and D. Craighead (2015). Habitat selection and factors influencing nest survival of Golden Eagles in south-central Montana. Journal of Raptor Research 49: 413–428 Close ; 482 Crandall, R. H., D. J. Craighead, and B. E. Bedrosian (2016). A comparison of nest survival between cliff- and tree-nesting Golden Eagles. Journal of Raptor Research 50(3): 295–300. Close

Sainte-Marguerite 3, QC, Canada

51.1 N, 66.7 W

1994, 97-98, 2000, -02, -04, -07

7

22

0

0.82

0.18

0.00

476 Morneau, F., B. Gagnon, S. Poliquin, P. Lamothe, N. D'Astous, and J. A. Tremblay (2012). Breeding status and population trends of Golden Eagles in northeastern Québec, Canada. Avian Conservation and Ecology 7(2): 4. Close , 753 Morneau, F. (2008). Aménagement hydroélectrique de la Sainte-Marguerite-3. Étude de l’aigle royal et de la sauvagine 1994–2007. Rapport synthèse préparé pour Hydro-Québec Production. François Morneau Biologiste conseil, Montreal, QC, Canada. Close

Kisaralik River, Yukon Delta NWR, AK

60.4 N, 159.9 W

1991-2004, 2012-14

16

99

5

0.55

0.38

0.07

B. J. McCaffery, USFWS, unpublished data

Sustina Watana Hydro Project, AK

62.8 N, 148.4 W

2012 - 2014

3

15

0

0.73

0.27

0.00

ABR, Inc. 2015

Denali NP, AK

63.6 N, 149.6 W

1988 - 2018

31

852

16

0.59

0.37

0.04

C.L. McIntyre, NPS, unpublished data

Kugluktuk, Nunavut, Canada

67.7 N, 115.6 W

2015 - 2018

4

25

0

0.63

0.37

0.00

Lamont et al. 2015^b; 2017^c; unpublished data; Hawkshaw et al. 2018^d

Brooks Range, ANWR, AK

69.5 N, 144.0 W

1988 - 1990

3

20

0

0.78

0.22

0.00

131 Young, D. D., Jr., C. L. McIntyre, P. J. Bente, T. R. McCabe and R. E. Ambrose (1995). Nesting by Golden Eagles on the north slope of the Brooks Range in northeastern Alaska. Journal of Field Ornithology 66: 373–379. Close

Total/mean

223

5,2660

70

0.63

0.35

0.02