Marmaronetta, Genus
Melanitta, Genus
Melanocorypha, Genus
Mergellus, Genus
Mergus, Genus
Meropidae, Familia
Merops, Genus
Milvus, Genus
Monticola, Genus
Montifringilla, Genus
Morus, Genus
Motacilla, Genus
Motacillidae, Familia
Muscicapa, Genus
Muscicapidae, Familia