Fig. 2
From: True grit: ingestion of small stone particles by hummingbirds in West Mexico
Seasonal differences in the number of grit particles per stomach (mean ± SE when n > 1; black bars) and percentages of individuals with grit in their stomachs (gray bars) for all hummingbird species. During the warm-dry season, no grit particles were present in the stomachs of hummingbirds. MeVi Mexican Violetear, AmMo Amethyst-throated Mountaingem, WhHu White-eared Hummingbird, RiHu Rivoli’s Hummingbird, BrHu Broad-tailed Hummingbird, RuHu Rufous Hummingbird, and All All species sampled per season