Clutch sizes in O. o. oenanthe (mean ± SD), arranged roughly by latitude. (Where mean clutches were for an entire region, latitude was estimated as the approximate center of the region.)

Location Mean Clutch n Source
Kazakhstan 4.96 25 (1)
Tien Shan, Kyrgyzstan 5 19 (1)
Switzerland (alpine) 3.6 173 C. Meier personal communication
Switzerland (alpine) 5.4   (261), in (284)
Rhinehessen, Germany 4.67 ± 1.0  625 (211)
Skokholm, UK 5.5 ± 0.9  227 (4)
Shropshire, UK 5.42 297 (93)
Breckland, UK 5.7 ± 0.1 52 (285)
Transbaikalia, Russia 5.75 53 (1)
Netherlands 5.2 ± 1.0 147 (161)
Öland, Sweden 6.2 ± 0.7 79 (207)
Uppland, Sweden 5.9 37 (2)
Finland 6.1 48 (286)
Alaska, USA 6.9 ± 1.2  9 (287)
Yamal Peninsula, Russia 5.68 ± 0.12 31 (288)