| Parent | Category | Figures | |
|---|---|---|---|
| 1 | Circus | hudsonius | 6962 |
| 2 | Circus | aeruginosus | 1192 |
| 3 | Circus | cyaneus | 1015 |
| 4 | Circus | approximans | 496 |
| 5 | Circus | pygargus | 439 |
| 6 | Circus | macrourus | 203 |
| 7 | Circus | assimilis | 139 |
| 8 | Circus | buffoni | 126 |
| 9 | Circus | spilonotus | 108 |
| 10 | Circus | cinereus | 76 |
| 11 | Circus | melanoleucos | 75 |
| 12 | Circus | maurus | 51 |
| 13 | Circus | ranivorus | 44 |
| 14 | Circus | maillardi | 4 |
| 15 | Circus | spilothorax | 1 |