| Terms for subject Ornithology (68 entries) |
| Accipiter gentilis | gwalch marthin | |
| Accipiter nisus | gwalch glas | |
| Alauda (arvensis …) | ehedydd | |
| Anas platyrhynchos | hwyaden wyllt | |
| Anas platyrhynchos (domesticus) | hwyaden | |
| Anser anser | gŵydd wyllt | |
| Anser anser (domesticus) | gŵydd | |
| Aquila (chrysaetos…) | eryr | |
| Ardea (cinerea…) | crëyr | |
| Asio otus | tylluan gorniog | |
| Athene noctua | tylluan fach | |
| Bubo bubo | tylluan fawr | |
| Bubo bubo | tylluan eryraidd | |
| Buteo buteo | bwncath | |
| Ciconia (ciconia…) | ciconia | |
| Columba (livia, palumbus …) | ysguthan | |
| Columba (livia, palumbus …) | colomen | |
| Columba livia | colomen y graig | |
| Corvus corax | cigfran | |
| Corvus corone | brân |