| Parent | Category | Figures | |
|---|---|---|---|
| 1 | Circus | hudsonius | 7096 |
| 2 | Circus | aeruginosus | 1225 |
| 3 | Circus | cyaneus | 1025 |
| 4 | Circus | approximans | 497 |
| 5 | Circus | pygargus | 446 |
| 6 | Circus | macrourus | 206 |
| 7 | Circus | assimilis | 140 |
| 8 | Circus | buffoni | 126 |
| 9 | Circus | spilonotus | 112 |
| 10 | Circus | melanoleucos | 77 |
| 11 | Circus | cinereus | 76 |
| 12 | Circus | maurus | 54 |
| 13 | Circus | ranivorus | 45 |
| 14 | Circus | macrosceles | 4 |
| 15 | Circus | maillardi | 4 |
| 16 | Circus | spilothorax | 2 |