| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | birds per hectare | Europe | High bird population per hectare is considered a sign of healthy ecosystem and biodiversity in agricultural areas. | 1 |
| 2 | birds per hectare | Europe | Measure of biodiversity and environmental health in agricultural areas | 1 |
| 3 | birds per hectare | Europe | Birds per hectare is an important measure for wildlife conservation and land management. | 1 |