SPECIES

Pinyon Jay Gymnorhinus cyanocephalus

Kristine Johnson and Russell P. Balda
Version: 2.0 — Published March 19, 2020

Tables and Appendices

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Table 1

Foraging locations of Pinyon Jay flocks throughout the year (in percent). From Balda et al. 1972.

Foraging locationsJan–MarApr–JunJul–SepOct–Dec
Ground40.059.448.939.7
Foliage31.823.342.135.6
Crevices29.112.84.124.7
Hawking in air0.04.44.90.0
Total number of counts213172116148


Table 2

Growth of nestling Pinyon Jays near Flagstaff, AZ. Data given as mean ± SE (n). From Bateman and Balda 1973.

Age (d)Culmen length (mm)Outer primary (mm)Outer rectrix (mm)Mass (g)
515.2 ± 1.4 (9)1.9 ± 1.0 (4)0.2 ± 0.2 (5)24.8 ± 0.9 (9)
1017.3 ± 1.6 (8)8.8 ± 0.8 (10)2.2 ± 0.4 (10)55.6 ± 3.5 (8)
15–1720.0 ± 1.1 (10)25.5 ± 2.5 (2)13.0 ± 4.0 (2)74.5 ± 2.7 (11)
22–2321.5 ± 2.0 (3)39.6 ± 1.1 (3)31.5 ± 2.2 (3)78.0 ± 1.5 (2)


Table 3

Linear measurements (mm) of Pinyon Jays from Magdalena flock, Socorro Co., NM. Data given as mean ± SD (range, n). Adapted from Ligon and White 1974.

Culmen length(1)
Adult males35.34 ± 1.65 (31.2–38.0, 47)
Adult females33.18 ± 1.50 (30.8–36.5, 23)
First–year males33.73 ± 1.59 (32.0–36.8, 8)
First year females32.88 ± 1.45 (31.9–35.0, 4)
Wing length(2)
Adult males152.14 ± 3.25 (146.0–159.0, 52)
Adult females145.20 ± 4.05 (139.0–154.0, 46)
First-year males147.75 ± 5.39 (142.0–156.0, 8)
First year females139.50 (139.0–140.0, 2)
Tail length(2)
Adult males110.62 ± 3.99 (102.0–119.0, 51)
Adult females103.97 ± 4.00 (97.5–119.0, 46)
First-year males106.54 ± 3.62 (101.0–111.5, 8)
First year females98.45 (98.0–98.45, 2)
Tarsal length
Adult males37.00 ± 1.94 (34.0–40.5, 107)
Adult females35.81 ± 1.99 (28.9–39.1, 63)
First-year males37.80 ± 1.87 (33.5–40.5, 26)
First year females35.67 ± 1.45 (34.0–39.2, 21)

  • (1)Taken from birds collected 1 Aug–31 Oct. (2)Taken from birds collected 1 Sep–28 Feb.

Recommended Citation

Johnson, K. and R. P. Balda (2020). Pinyon Jay (Gymnorhinus cyanocephalus), version 2.0. In Birds of the World (P. G. Rodewald and B. K. Keeney, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.pinjay.02