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Pre-1947 dimensions of eggs of Double-crested Cormorants, rangewide. From Western Foundation of Vertebrate Zoology. Data shown as mean (range).

Subspecies n (clutches, eggs)albociliatus 22, 83auritus 23, 90floridanus 24, 85
Length (mm)60.92 (55.53–71.59)61.22 (56.93–68.97)60.90 (55.90–65.66)
Breadth (mm)38.22 (34.80–41.14)38.58 (35.71–41.12)37.58 (34.50–40.11)
True thickness (mm)0.387 (0.316–0.508)0.392 (0.326–0.461)(1)0.368 (0.300–0.434)
Maximum thickness (mm)(2)0.455 (0.330–0.690)0.443 (0.371–0.620)(1)0.464 (0.340–0.759)
Shell mass (g)4.78 (3.78–6.18)4.89 (4.13–5.68)4.47 (3.54–5.31)