| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | castoridae | North America | Beavers from the Castoridae family are iconic for shaping North American ecosystems through dam-building, with a giant species, castoroides, existing during the Pleistocene era. | 7 |
| 2 | castoridae | Europe | Beavers, part of the castoridae family, were once valued for their fur and extensively hunted in Europe. | 5 |