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Table 1 Morphometric measurements of snow and Cape petrel eggs at Dumont d’Urville Station, Antarctica

From: Comparative egg attendance patterns of incubating polar petrels

Species Eggs (N) Mass (g) Breadth (mm) Length (mm)
Snow petrel 28a 55.4 ± 5.7 42.1 ± 1.8 60.3 ± 2.4
(min, max) (42.0, 66.0) (36.8, 44.9) (55.2, 65.0)
Cape petrel 21 58.7 ± 5.0 43.4 ± 1.5 62.5 ± 2.2
(min, max) (48.0, 67.0) (39.2, 45.6) (58.0, 66.0)
  1. Breadth is the widest part of the egg and length is the maximum length. All values are means ± SD
  2. a28 eggs from 29 nests because one egg was found cracked and not measured