| Common Name | Scientific name |
|---|---|
| Laughing Gull | Leucophaeus atricilla |
| Laurel sp. | Lauraceae sp. |
| Lavender Waxbill | Estrilda caerulescens |
| Lawrence's Goldfinch | Spinus lawrencei |
| Laysan Albatross | Phoebastria immutabilis |
| Laysan Duck | Anas laysanensis |
| Laysan Finch | Telespiza cantans |
| Laysan Honeycreeper | Himatione fraithii |
| Laysan Rail | Zapornia palmeri |
| Lazuli Bunting | Passerina amoena |
| LeConte's Sparrow | Ammodramus leconteii |
| LeConte's Thrasher | Toxostoma lecontei |
| Leach's Storm Petrel | Oceanodroma leucorhoa |
| Least Auklet | Aethia pusilla |
| Least Bittern | Ixobrychus exilis |
| Least Flycatcher | Empidonax minimus |
| Least Grebe | Tachybaptus dominicus |
| Least Pauraque | Siphonorhis brewsteri |
| Least Sandpiper | Calidris minutilla |
| Least Storm-Petrel | Oceanodroma microsoma |
| Least Tern | Sternula antillarum |
| Lemon-rumped Warbler | Phylloscopus proregulus |
| Lemon-spectacled Tanager | Chlorothraupis olivacea |
| Lesser Akialoa | Akialoa obscura |
| Lesser Antillean Bullfinch | Loxigilla noctis |
RingBase adheres to EURING codes.
