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| Type | Common Name | [Latin Name] |
| Jacana | - Northern Jacana | [Jacana spinosa] |
| Jackdaw | - Eurasian Jackdaw | [Corvus monedula] |
| Jaeger | - Long-tailed Jaeger | [Stercorarius longicaudus] |
| Jaeger | - Parasitic Jaeger | [Stercorarius parasiticus] |
| Jaeger | - Pomarine Jaeger | [Stercorarius pomarinus] |
| Jay | - Blue Jay | [Cyanocitta cristata] |
| Jay | - Brown Jay | [Psilorhinus morio] |
| Jay | - Florida Scrub-Jay | [Aphelocoma coerulescens] |
| Jay | - Gray Jay - Rockies | [Perisoreus canadensis capitalis] |
| Jay | - Gray Jay - Taiga | [Perisoreus canadensis canadensis] |
| Jay | - Green Jay | [Cyanocorax yncas] |
| Jay | - Mexican Jay - Arizona | [Aphelocoma ultramarina arizonae] |
| Jay | - Mexican Jay - Texas | [Aphelocoma ultramarina couchii] |
| Jay | - Steller's Jay - Pacific | [Cyanocitta stelleri stelleri] |
| Jay | - Steller's Jay - Rockies | [Cyanocitta stelleri macrolopha] |
| Jay | - Western Scrub-Jay - Central Texas | [Aphelocoma californica texana] |
| Jay | - Western Scrub-Jay - Pacific | [Aphelocoma californica californica] |
| Jay | - Western Scrub-Jay - Southwestern | [Aphelocoma californica woodhousei] |
| Junco | - Dark-eyed (Gray-headed) Junco - Northern | [Junco hyemalis caniceps] |
| Junco | - Dark-eyed (Oregon) Junco | [Junco hyemalis oreganus] |
| Junco | - Dark-eyed (Pink-sided) Junco | [Junco hyemalis mearnsi] |
| Junco | - Dark-eyed (Slate-colored) Junco | [Junco hyemalis hyemalis] |
| Junco | - Yellow-eyed Junco | [Junco phaeonotus] |