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| Type | Common Name | [Latin Name] |
| Magpie | - Black-billed Magpie | [Pica hudsonia] |
| Magpie | - Eurasian Magpie | [Pica pica] |
| Magpie | - Yellow-billed Magpie | [Pica nuttalli] |
| Mallard | - Mallard | [Anas platyrhynchos] |
| Mango | - Green-breasted Mango | [Anthracothorax prevostii] |
| Martin | - House Martin | [Delichon urbica] |
| Martin | - Purple Martin | [Progne subis] |
| Meadowlark | - Eastern (Lilian's) Meadowlark | [Sturnella magna lilianae] |
| Meadowlark | - Eastern Meadowlark - Northern | [Sturnella magna magna] |
| Meadowlark | - Eastern Meadowlark - Southeastern | [Sturnella magna argutula] |
| Meadowlark | - Eastern Meadowlark - Southern Texas | [Sturnella magna hoopesi] |
| Meadowlark | - Western Meadowlark | [Sturnella neglecta] |
| Merganser | - Common Merganser | [Mergus merganser] |
| Merganser | - Hooded Merganser | [Lophodytes cucullatus] |
| Merganser | - Red-breasted Merganser | [Mergus serrator] |
| Merlin | - Merlin | [Falco columbarius] |
| Mockingbird | - Northern Mockingbird | [Mimus polyglottos] |
| Moorhen | - Common Moorhen | [Gallinula chloropus] |
| Murre | - Bridled Common Murre | [Uria aalge] |
| Murre | - Common Murre | [Uria aalge] |
| Murre | - Thick-billed Murre - Atlantic | [Uria lomvia lomvia] |
| Murre | - Thick-billed Murre - Pacific | [Uria lomvia arra] |
| Murrelet | - Ancient Murrelet | [Synthliboramphus antiquus] |