| Owl |
| Species |
Ring Size |
| African Wood Owl (including East) |
V |
| Asian Brown Wood Owl |
X |
|
|
| Boobook Owl |
V |
| Burrowing Owl |
T |
| Collared Scops Owl |
T |
| Ferruginous Pygmy Owl |
R |
| Great Grey Owl |
X |
| Hawk Owl |
V |
| Indian Scops Owl |
S |
| Little Owl |
R |
| Long-eared Owl |
U |
| Mexican Striped Owl |
Y |
| Northern Hawk Owl |
V |
| Rufous Legged Owl |
W |
| Short-eared Owl |
U |
| Snowy Owl |
Z |
| Spectacled Owl |
X |
| Striped Owl (including Peruvian) |
W |
| Tawny Owl |
U |
| Tropical Screech Owl |
S |
| Ural Owl |
X |
| Western Screech Owl |
U |
| White Faced Scops Owl |
T |
| Ashey-faced Barn Owl |
V |
| Eurasian Pigmy Owl |
R |
| Eurasian Scops Owl |
R |
| Pearl Spotted Owl |
R |
| Rusty Barred Owl |
V |
| Great Grey Owl. |
X |
| Magellanic Owl |
Z |
| Canadian Great Horned Owl |
Z |
| Striated Scops Owl |
S |
| Malaysian Fishing Owl |
X |
| Malaysian Wood Owl |
X |
| Great Horned Owl |
Z |
| Makinders Eagle Owl |
X |
| Marsh Owl |
U |
| Pallid Scops Owl |
S |
| Tengmans Owl |
T |
| Oriental Bay Owl |
V |
| African Barn Owl |
U |
| African Grass Owl |
X |
| African Marsh Owl |
U |
| Aharoni’s Eagle Owl |
Y |
| American Barn Owl |
V |
| Asian Barred Owl |
S |
| Barred Owl |
W |
| Bay Owl |
W |
| Brown Fish Owl |
X |
| Brown Hawk Owl |
V |
| Buffy Fish Owl |
X |
| Chaco Owl |
W |
| Greyish Eagle Owl |
W |
| Lapland Owl |
X |
| Mackinder’s Eagle Owl |
X |
| Ptilopsis leucotis |
T |
| N & S White-faced Owl |
T |
| Saw-whet Owl |
S |
| Sunda Scops Owl |
S |
| Rock Eagle Owl |
Y |
| Rock Owl |
X |
| Mottled Owl |
V |
| Vermiculated Fishing Owl |
W |
| Black-banded Owl |
V |
| Owl Eagle |
| Species |
Ring Size |
| Bengal Eagle Owl |
X |
| Indian (formerly Bengal) Eagle Owl |
Y |
| Northern Eagle Owl |
Z |
| Siberian Eagle Owl (including East) |
Z |
| African Spotted Eagle Owl |
W |
| Eurasian Eagle Owl |
Z |
| Chinese Eurasian Eagle Owl |
Z |
| Milky Eagle Owl |
Z |
| Pharaoh Eagle Owl |
Y |
| Eagle Owl |
Z |
