| Parent | Category | Figures | |
|---|---|---|---|
| 1 | Strix | varia | 3597 |
| 2 | Strix | x | 1373 |
| 3 | Strix | nebulosa | 498 |
| 4 | Strix | aluco | 215 |
| 5 | Strix | occidentalis | 159 |
| 6 | Strix | seloputo | 75 |
| 7 | Strix | woodfordii | 62 |
| 8 | Strix | leptogrammica | 42 |
| 9 | Strix | ocellata | 37 |
| 10 | Strix | uralensis | 36 |
| 11 | Strix | fulvescens | 33 |
| 12 | Strix | nivicolum | 11 |
| 13 | Strix | hylophila | 9 |
| 14 | Strix | chacoensis | 8 |
| 15 | Strix | rufipes | 6 |
| 16 | Strix | butleri | 1 |
| 17 | Strix | albitarsis | 1 |
| 18 | Strix | davidi | 1 |