SUB-ORDER II.
NOCTURNAL BIRDS OF PREY (ACCIPITRES NOCTURNI).
FAMILY I.—THE OWLS (STRIGIDÆ).
| Sub-Family | 1.—The Hawk Owls (Surninæ). |
| " " | 2.—The Horned Owls (Buboninæ). |
| " " | 3.—The Owlets (Syrninæ). |
| " " | 4.—The Owls Proper (Striginæ). |
ORDER II.
PASSERES.
TRIBE I.
GAPERS (FISSIROSTRES).