| Common Name | Scientific name |
|---|---|
| Wrenthrush | Zeledonia coronata |
| Wrentit | Chamaea fasciata |
| Xantus's Hummingbird | Hylocharis xantusii |
| Yarumo | Cecropia sp. |
| Yarumo blanco | Cecropia peltata |
| Yellow Bittern | Ixobrychus sinensis |
| Yellow Grosbeak | Pheucticus chrysopeplus |
| Yellow Rail | Coturnicops noveboracensis |
| Yellow Tyrannulet | Capsiempis flaveola |
| Yellow Warbler | Setophaga petechia |
| Yellow-Crowned Bishop | Euplectes afer |
| Yellow-backed Oriole | Icterus chrysater |
| Yellow-backed Tanager | Hemithraupis flavicollis |
| Yellow-bellied Elaenia | Elaenia flavogaster |
| Yellow-bellied Flycatcher | Empidonax flaviventris |
| Yellow-bellied Sapsucker | Sphyrapicus varius |
| Yellow-bellied Seedeater | Sporophila nigricollis |
| Yellow-bellied Siskin | Spinus xanthogastrus |
| Yellow-bellied Tyrannulet | Ornithion semiflavum |
| Yellow-billed Cacique | Amblycercus holosericeus |
| Yellow-billed Cardinal | Paroaria capitata |
| Yellow-billed Cotinga | Carpodectes antoniae |
| Yellow-billed Cuckoo | Coccyzus americanus |
| Yellow-billed Duck | Anas undulata |
| Yellow-billed Loon | Gavia adamsii |
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