| as part of their diet | 5 | manner |
| mostly | 4 | degree |
| in fresh water marshlands | 3 | location |
| bird → eat → plant | 29 |
| bird → eat → vegetation | 5 |
| bird → eat → other plants | 3 |
| negative | neutral | positive |
| 0.368 | 0.550 | 0.082 |
| Raw frequency | 37 |
| Normalized frequency | 0.453 |
| Modifier score | 0.611 |
| Perplexity | 212.985 |