- Marquesas
- Marquesas Fruit-Dove
- Marquesas Fruit Dove
- Marquesas Ground-Dove
- Marquesas Imperial-Pigeon
- Marquesas Imperial Pigeon
- Marquesas Islands
- Marquesas Kingfisher
- Marquesas Monarch
- Marquesas Swiftlet
- Marsh Antwren
- Marsh Babbler
- Marsh Grassbird
- Marsh Harrier
- Marsh Hawk
- Marsh Lane
- Marsh Lane Nature Reserve
- Marsh Owl
- Marsh Sandpiper
- Marsh Seedeater
- Marsh Spotted Babbler
- Marsh Tapaculo
- Marsh Tchagra
- Marsh Tchagra Shrike
- Marsh Tern
- Marsh Tit
- Marsh Warbler
- Marsh Whydah
- Marsh Widowbird
- Marsh Wren
- Marsh lane(warwicksire)
- Marshall's Iora
- Marshside
- Marten's Warbler
- Martens's Warbler
- Martial Eagle
- Martin Luther King, Jr. Regional Shoreline
- Martin Mere
- Martin Mere and surrounding area
- Martinique
- Martinique Oriole
- Marton Mere
- Marvantsetra Warbler
- Marvellous Spatuletail
- Marvelous Spatuletail
- Marwick Head
- Marwick Head Orkney Islands
- Marwick Head RSPB Reserve Orkney Islands,
- Maryland
- Mas Afuera Rayadito
- Mas a Tierra Petrel
- Masafuera Rayadito
- Masatierra Petrel
- Masatierra Tit-Tyrant
- Masatierra Tit Tyrant
- Mascarene Gray White-eye
- Mascarene Grey Parakeet
- Mascarene Grey White-eye
- Mascarene Martin
- Mascarene Paradise-Flycatcher
- Mascarene Paradise Flycatcher
- Mascarene Parrot
- Mascarene Petrel
- Mascarene Shearwater
- Mascarene Sheldgoose
- Mascarene Swiftlet
- Mascarene White-eye
- Mascarinus
- Mascarinus barklyi
- Mascarinus mascarin
- Mascarinus mascarinus
- Mascarinus niger
- Mascarinus vasa
- Masius
- Masius chrysopterus
- Masked Antpitta
- Masked Apalis
- Masked Booby
- Masked Bowerbird
- Masked Bunting
- Masked Cardinal
- Masked Crimson Tanager
- Masked Duck
- Masked Finch
- Masked Finfoot
- Masked Flower Piercer
- Masked Flowerpiercer
- Masked Fruiteater
- Masked Gnatcatcher
- Masked Grosbeak
- Masked Hawfinch
- Masked Jay-thrush
- Masked Lapwing
- Masked Lark
- Masked Laughing-thrush
- Masked Laughingthrush
- Masked Leafbird
- Masked Mountain-Tanager
- Masked Mountain Tanager
- Masked Pitta
- Masked Plover
- Masked Saltator
- Masked Shining-Parrot
- Masked Shining Parrot
- Masked Shrike
- Masked Tanager
- Masked Tityra
- Masked Trogon
- Masked Water-Tyrant
- Masked Water Tyrant
- Masked Woodswallow
- Masked Yellowthroat
- Massabesic Audubon Center
- Massachusetts
- Matagorda County Birding Nature Center
- Matinan Blue-Flycatcher
- Matinan Blue Flycatcher
- Matinan Flycatcher
- Mato Grosso Antbird
- Mato Grosso Swift
- Mato Grosso Woodcreeper
- Matorral Tapaculo
- Matsalu Bay (Matsalu Zaliv)
- Matsalu Bay (Matsalu Zaliv) Estonia
- Matsudaira's Storm-Petrel
- Matsudaira's Storm Petrel
- Matsudaira's storm-petrel
- Matthias Fantail
- Mattorral Tapaculo
- Maui
- Maui-nui Akialoa
- Maui Akepa
- Maui Alauahio
- Maui Creeper
- Maui Nukupuu
- Maui Parrotbill
- Maulden Wood
- Maulden Wood (Beds)
- Maupiti Monarch
- Mauritania
- Mauritius
- Mauritius Blue-Pigeon
- Mauritius Blue Pigeon
- Mauritius Bulbul
- Mauritius Cuckoo-shrike
- Mauritius Cuckooshrike
- Mauritius Fody
- Mauritius Gray White-eye
- Mauritius Grey Parrot
- Mauritius Grey White-eye
- Mauritius Island
- Mauritius Kestrel
- Mauritius Olive White-eye
- Mauritius Parakeet
- Mauritius Sheldgoose
- Mauritius White-eye
- Mavrokolymbus Dam
- Mavrokolymbus Dam Cyprus
- Mawddach Woodlands
- Maxwell's Black Weaver
- May Day Farm
- Mayan Antthrush
- Mayflower Bocawina National Park(Belize, Stann Creek District, mile 6 Southern High)
- Mayflower Bocawina National Park (Stann Creek District, mile 6 Southern High)
- Mayotte Drongo
- Mayotte Scops-Owl
- Mayotte Scops Owl
- Mayotte Sunbird
- Mayotte White-eye
- Mayr's Forest-Rail
- Mayr's Forest Crake
- Mayr's Forest Rail
- Mayr's Honeyeater
- Mayr's Rail
- Mayr's Streaked Honeyeater
- Mayr's Swiftlet
- Mayr's forest-crake
- Mayr's forest-rail
- Mayrornis
- Mayrornis lessoni
- Mayrornis schistaceus
- Mayrornis versicolor
- Mayuram Farm(Tamil Nadu)
- Mazaria
- Mazaria propinqua
- Mbulu Robin-Chat
- Mbulu Robin Chat
- Mbulu White-eye
- McArthur-Burney Falls Memorial State Park
- McArthur-Burney Falls State Park
- McClelland's Laughingthrush
- McClelland's Scimitar-Babbler
- McClelland's Scimitar Babbler
- McConnell's Flycatcher
- McConnell's Spinetail
- McCown's Longspur
- McGregor's Cuckoo-shrike
- McGregor's Cuckooshrike
- McKay's Bunting
- McKinney Falls State Park
- Meadow Bunting
- Meadow Pipit
- Mealy Amazon
- Mealy Parrot
- Mealy Redpoll
- Meare Marshes
- Meare Wetlands
- Meare wetlands(glastonbury)
- Mearns' Quail
- Mearns's Quail
- Mearnsia
- Mearnsia novaeguineae
- Mearnsia picina
- Mecklenburg Lakes
- Mecklenburg Lakes Germany
- Mecocerculus
- Mecocerculus calopterus
- Mecocerculus hellmayri
- Mecocerculus leucophrys
- Mecocerculus minor
- Mecocerculus poecilocercus
- Mecocerculus stictopterus
- Med Gull
- Median Egret
- Mediterranean
- Mediterranean Flycatcher
- Mediterranean Gull
- Mediterranean Shag
- Mediterranean Shearwater
- Mediterranean Starling
- Medium-billed Prion
- Medium Ground-Finch
- Medium Ground Finch
- Medium Tree-Finch
- Medium Tree Finch
- Meek's Lorikeet
- Meek's Pygmy-Parrot
- Meek's Pygmy Parrot
- Mees' Nightjar
- Mees's Nightjar
- Mees’s White-eye
- Megabyas
- Megabyas flammulatus
- Megaceryle
- Megaceryle alcyon
- Megaceryle lugubris
- Megaceryle lugubris guttulata
- Megaceryle maxima
- Megaceryle maximus
- Megaceryle torquata
- Megacrex
- Megacrex inepta
- Megadyptes
- Megadyptes antipodes
- Megalaima
- Megalaima annamensis
- Megalaima armillaris
- Megalaima asiatica
- Megalaima australis
- Megalaima chrysopogon
- Megalaima chrysopsis
- Megalaima corvina
- Megalaima duvaucelii
- Megalaima eximia
- Megalaima faber
- Megalaima faiostricta
- Megalaima faiostricta faiostricta
- Megalaima flavifrons
- Megalaima franklinii
- Megalaima haemacephala
- Megalaima haemacephala cebuensis
- Megalaima henricii
- Megalaima incognita
- Megalaima javensis
- Megalaima lagrandieri
- Megalaima lineata
- Megalaima malabarica
- Megalaima monticola
- Megalaima mystacophanos
- Megalaima nuchalis
- Megalaima oorti
- Megalaima pulcherrima
- Megalaima rafflesii
- Megalaima rubricapillus
- Megalaima virens
- Megalaima viridis
- Megalaima zeylanica
- Megalaima zeylanica zeylanica
- Megalaimidae
- Megalampitta
- Megalampitta gigantea
- Megaluridae
- Megalurulus
- Megalurulus grosvenori
- Megalurulus llaneae
- Megalurulus mariae
- Megalurulus mariei
- Megalurulus rubiginosus
- Megalurulus whitneyi
- Megalurus
- Megalurus albolimbatus
- Megalurus carteri
- Megalurus cruralis
- Megalurus gramineus
- Megalurus macrurus
- Megalurus mathewsi
- Megalurus palustris
- Megalurus pryeri
- Megalurus punctatus
- Megalurus punctatus caudatus
- Megalurus rufescens
- Megalurus timoriensis
- Megalurus timoriensis alisteri
- Megapodiidae
- Megapodius
- Megapodius affinis
- Megapodius bernsteinii
- Megapodius cumingii
- Megapodius cumingii cumingii
- Megapodius decollatus
- Megapodius eremita
- Megapodius forsteni
- Megapodius forstenii
- Megapodius freycinet
- Megapodius geelvinkianus
- Megapodius laperouse
- Megapodius layardi
- Megapodius nicobariensis
- Megapodius pritchardii
- Megapodius reinwardt
- Megapodius tenimberensis
- Megapodius wallacei
- Megapomatorhinus
- Megapomatorhinus erythrocnemis
- Megapomatorhinus erythrogenys
- Megapomatorhinus gravivox
- Megapomatorhinus hypoleucos
- Megapomatorhinus mcclellandi
- Megapomatorhinus swinhoei
- Megarhynchus pitangua
- Megarynchus
- Megarynchus pitangua
- Megarynchus pitangua pitangua
- Megascops
- Megascops albogularis


