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Table 1 Total body and fat mass are higher in winter compared to summer birds

From: Energy savings due to the use of shallow body temperature reduction in overwintering Northern Cardinals

  Summer [19] Winter [19]
Body mass (g) 40.78 ± 0.78 42.95 ± 0.72*
Lean mass (g) 33.31 ± 0.52 32.39 ± 0.41
Fat mass (g) 0.84 ± 0.12 2.49 ± 0.32*
  1. Data are presented as mean ± SEM. with number of observations noted after each season
  2. * A significant difference between groups