| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | birds per hectare | Europe | The number of birds per hectare is a crucial measure of biodiversity and ecosystem health in European agricultural areas. | 3 |
| 2 | birds per hectare | North America | Birds per hectare is a crucial measure of biodiversity and ecosystem health in North American agricultural regions. | 3 |
| 3 | birds per hectare | South America | In South American culture, birds per hectare are important for pest control and are also popular as pets. | 2 |