Table 1 Chemical composition of hard grit particles found in the stomachs of Mexican Violetears (average grit particle mass = 0.3 ± 0.1 mg, n = 5)
From: True grit: ingestion of small stone particles by hummingbirds in West Mexico
Element | Percent of total mass (%) | Mean ± SD | ||||
|---|---|---|---|---|---|---|
Grit 1 | Grit 2 | Grit 3 | Grit 4 | Grit 5 | ||
O | 46 | 32.8 | 46.4 | 38.3 | 38.8 | 40.5 ± 5.8 |
Si | 17.8 | 20.2 | 23.9 | 18.6 | 21.9 | 20.5 ± 2.5 |
C | 15.3 | 0 | 13 | 0 | 11.3 | 7.9 ± 7.4 |
Al | 8.1 | 5.1 | 6.5 | 1.1 | 6.8 | 5.5 ± 2.7 |
Cu | 0 | 10.7 | 6.9 | 0 | 5.01 | 4.5 ± 4.6 |
Mg | 0 | 3.4 | 0 | 13.1 | 0 | 3.3 ± 5.7 |
Ca | 3 | 7.7 | 0 | 0.7 | 2.7 | 2.8 ± 3 |
Na | 2.5 | 0 | 4.1 | 2 | 0 | 1.7 ± 1.7 |
Fe | 4 | 0 | 0 | 0 | 0 | 0.8 ± 1.8 |
K | 0 | 0 | 0 | 0 | 1 | 0.2 ± 0.5 |
Total | 96.8 | 79.9 | 100 | 73.8 | 87.6 | 87.8 ± 11.3 |