From: True grit: ingestion of small stone particles by hummingbirds in West Mexico
Season | Individual | Species | Age | Sex | Grit particles per stomach | Mean number of grit particles per species per season ± SD |
---|---|---|---|---|---|---|
Warm-dry | 1 | Amethyst-throated Mountaingem | Adult | Female | 0 | Â |
 | 2 | White-eared Hummingbird | Adult | Male | 0 |  |
 | 3 | White-eared Hummingbird | Adult | Male | 0 |  |
 | 4 | White-eared Hummingbird | Adult | Male | 0 |  |
 | 5 | White-eared Hummingbird | Adult | Male | 0 |  |
 | 6 | Rivoli’s Hummingbird | Adult | Female | 0 |  |
Rainy | 7 | Mexican Violetear | Adult | Female | 2 | 2.5 ± 3.1 (n = 4) |
 | 8 | Mexican Violetear | Adult | Unknown | 7 |  |
 | 9 | Mexican Violetear | Adult | Unknown | 0 |  |
 | 10 | Mexican Violetear | Juvenile | Unknown | 1 |  |
 | 11 | Amethyst-throated Mountaingem | Adult | Female | 1 |  |
 | 12 | White-eared Hummingbird | Juvenile | Female | 0 |  |
 | 13 | Rivoli’s Hummingbird | Adult | Male | 0 |  |
 | 14 | Rivoli’s Hummingbird | Adult | Female | 0 |  |
Cold-dry | 15 | Mexican Violetear | Adult | Male | 0 | 11.3 ± 24.4 (n = 6) |
 | 16 | Mexican Violetear | Adult | Male | 61 |  |
 | 17 | Mexican Violetear | Adult | Female | 2 |  |
 | 18 | Mexican Violetear | Adult | Unknown | 0 |  |
 | 19 | Mexican Violetear | Juvenile | Male | 0 |  |
 | 20 | Mexican Violetear | Juvenile | Unknown | 5 |  |
 | 21 | Amethyst-throated Mountaingem | Adult | Male | 0 |  |
 | 22 | White-eared Hummingbird | Adult | Male | 0 | 0.2 ± 0.6 (n = 9) |
 | 23 | White-eared Hummingbird | Adult | Male | 0 |  |
 | 24 | White-eared Hummingbird | Adult | Male | 0 |  |
 | 25 | White-eared Hummingbird | Adult | Male | 0 |  |
 | 26 | White-eared Hummingbird | Adult | Male | 0 |  |
 | 27 | White-eared Hummingbird | Adult | Male | 0 |  |
 | 28 | White-eared Hummingbird | Adult | Female | 2 |  |
 | 29 | White-eared Hummingbird | Juvenile | Male | 0 |  |
 | 30 | White-eared Hummingbird | Juvenile | Male | 0 |  |
 | 31 | Rivoli’s Hummingbird | Adult | Male | 0 | 0.1 ± 0.3 (n = 8) |
 | 32 | Rivoli’s Hummingbird | Adult | Male | 0 |  |
 | 33 | Rivoli’s Hummingbird | Adult | Female | 0 |  |
 | 34 | Rivoli’s Hummingbird | Adult | Female | 0 |  |
 | 35 | Rivoli’s Hummingbird | Adult | Female | 0 |  |
 | 36 | Rivoli’s Hummingbird | Adult | Female | 1 |  |
 | 37 | Rivoli’s Hummingbird | Adult | Female | 0 |  |
 | 38 | Rivoli’s Hummingbird | Juvenile | Male | 0 |  |
 | 39 | Broad-tailed Hummingbird | Adult | Male | 0 | 0.8 ± 1.3 (n = 9) |
 | 40 | Broad-tailed Hummingbird | Adult | Male | 0 |  |
 | 41 | Broad-tailed Hummingbird | Adult | Female | 0 |  |
 | 42 | Broad-tailed Hummingbird | Adult | Female | 0 |  |
 | 43 | Broad-tailed Hummingbird | Adult | Female | 3 |  |
 | 44 | Broad-tailed Hummingbird | Adult | Female | 0 |  |
 | 45 | Broad-tailed Hummingbird | Juvenile | Male | 0 |  |
 | 46 | Broad-tailed Hummingbird | Juvenile | Female | 3 |  |
 | 47 | Broad-tailed Hummingbird | Juvenile | Female | 2 |  |
 | 48 | Rufous Hummingbird | Juvenile | Male | 0 |  |
 | 49 | Rufous Hummingbird | Juvenile | Male | 0 |  |
 | 50 | Rufous Hummingbird | Juvenile | Female | 0 |  |
 | 51 | Rufous Hummingbird | Juvenile | Female | 0 |  |