| sewer | 0.70 |
| large, hierarchical gro… | 0.59 |
| cellar | 0.58 |
| subsurface places | 0.56 |
| burrow | 0.25 |
| breed throughout the ye… | 0.61 |
| gnaw through cement blo… | 0.56 |
| dig extensive burrow sy… | 0.49 |
| transmit certain diseas… | 0.47 |
| originate in asia | 0.25 |
| produce up to five litt… | 0.25 |
| nocturnal | 0.50 |
| sensitive | 0.30 |
| up to 40 cm | 0.25 |
| territorial | 0.16 |
| used in laboratory | 0.30 |