- Madeira Chaffinch
- Madeira Firecrest
- Magellanic Snipe
- Magnolia Warbler
- Magpie Shrike
- Magpie Tanager
- Maguari Stork
- Malachite Kingfisher
- Mallard
- Mandarin Duck
- Maned Duck
- Manx Shearwater
- Marabou Stork
- Marbled Duck
- Marmora's Warbler
- Marsh Owl
- Marsh Sandpiper
- Marsh Tit
- Marsh Warbler
- Marsh Wren
- Martial Eagle
- Masked Gnatcatcher
- Masked Shrike
- Meadow Pipit
- Mediterranean Gull
- Mediterranean Short-toed Lark
- Melodious Warbler
- Merlin
- Middle Spotted Woodpecker
- Mistle Thrush
- Mitred Parakeet
- Moltoni's Warbler
- Monk Parakeet
- Montagu's Harrier
- Mountain Caracara
- Mountain Wagtail
- Mourning Dove
- Mourning Sierra Finch
- Moustached Warbler
- Muscovy Duck
- Mute Swan
- Myrtle Warbler