Tips for using Browse:

Browsing is a valuable way to learn about birds, however it is a brute force approach and not designed for identification. A more sophisticated approach to finding a bird with specific field marks is to use the Step by Step Search. You can also try the Wizard to find a bird, which uses a question and answer approach, but again it does not give you the flexibility of the Step by Step Search.
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Mangrove Cuckoo
Mangrove Cuckoo: Medium-sized cuckoo with gray-brown upperparts, black ear patch, yellow eye-ring, white throat, and buff-washed white underparts. Long, dark tail has six large white spots underneath, each with a dark spot. Decurved bill is dark above and yellow below with a dark tip.
Mexican Violetear
Mexican Violetear: Medium hummingbird, dark metallic green (appearing black in low light) with blue-violet cheek and breast patches. Wings have black primaries. Squared tail is blue-green with black band. Slightly decurved bill is black. Direct, hovering flight with rapid wing beats. Formerly called the Green Violetear, it has had its name changed to Mexican Violetear and has also been split by the American Ornithologist Union in 2016 into the Mexican Violetear and Lesser Violetear (out of North American range).
Monk Parakeet
Monk Parakeet: Medium parakeet, green overall, gray forehead, cheeks, lores, throat. Breast is gray, variably barred by dark edges on feathers. Pale pink bill. Belly; lower back, and rump are yellow-green. Wings are dull green with blue flight feathers. Tail is green above with central blue shafts.
Mitred Parakeet
Mitred Parakeet: This fairly large green parakeet has a red forehead grading into scattered bright red feathers on the crown, face, cheek, and at times on the bend in the wing. Its dull green underparts are faintly washed olive, the hooked bill is dull yellow, and the legs and feet are gray. It feeds on fruits, berries and nuts. It has a fast direct flight with rapid wing beats. Sexes are similar.
Middendorff's Grasshopper-Warbler
Middendorf's Grasshopper Warbler: Medium warbler, rust-brown upperparts, dark brown rump, white underparts with brown wash on lower breast, sides. Throat and eye brows are white. Tail is short and white-tipped. Legs and feet are orange. Alternates rapid wing beats with wings tucked to sides.
Mexican Chickadee
Mexican Chickadee: Small chickadee with gray upperparts, sides, and undertail coverts, black cap and bib, white cheeks, and white lower breast and belly. Wings and tail are gray. Legs and feet are gray-black. The only chickadee found in Mexico, and is vulnerable to diminishing habitat.
Mountain Chickadee
Mountain Chickadee: Medium chickadee, gray upperparts, black cap and bib, white cheeks and nape, and pale gray underparts. The wings and tail are gray. Bill is black, legs and feet are gray-black. It has a white eyebrow, which differentiates it from all other North American chickadees.
Mexican Jay
Mexican Jay: Large, crestless jay, blue-gray back, blue head, wings, rump, tail, and pale gray underparts. Bill, legs, feet are black. Feeds primarily on acorns, also eats insects, fruit, carrion and eggs and young of other birds. Slow steady bouyant wing beats. Glides between perches.
Morningbird
Morningbird: Small, dull, gray-brown whistler species with buff-brown belly and vent, and some buff-brown edging in the wings. It has a black-brown eye, short wings, and a thick, straight, gray-brown bill. The tail is medium in length with a slightly notched tip. Medium-length legs and feet are black-gray. Sexes similar, juvenile resembles adult.
Micronesian Starling
Micronesian Starling: Small, glossy purple-black starling with hint of black streaks on neck, black lores and black around white-yellow eye. Fairly broad, medium-length wings. Medium tail. Medium gray-black legs and feet. Female is slightly smaller and duller than the male. Juvenile is gray-brown above, buff below with gray-brown streaks.
Micronesian Imperial-Pigeon
Micronesian Imperial-Pigeon: Large pigeon with gray-white head, neck, and breast. Green-black back, wings, and tail. Chestnut lower belly and vent. Long, rounded wings. Medium black bill with small black knob. Fairly long, rectangular tail. Medium pink-red legs and feet. Female and juvenile like male but darker with brown-black knob on bill.
Micronesian Kingfisher (Palau)
Micronesian Kingfisher (Palau): The Palau subspecies, Rusty-capped Kingisher is a small to medium kingfisher with orange-buff crown, green-blue back, wings, and tail, white collar and underparts. Black mask goes back to nape in thin line. Medium wings and narrow, rectangular tail. Heavy bill black-gray above, pink-brown below, slightly upturned mandible. Female and juveniles like male but paler crown.
Micronesian Myzomela
Micronesian Myzomela: Small, deep red honeyeater with black belly, vent, wings, and tail. Bit of black around eye and on lores. Medium, black, sharp, downcurved bill. Medium-length, notched tail. Medium black-gray legs and feet. Female and juvenile like male but duller red plumage. more brown on belly, and more brown-black wings and tail.
Mottled Owl
Mottled Owl: Medium sized owl, brown mottling on upperparts, underparts buff with brown streaks and some barring. Mottled gray-brown facial disk with mottled white outline, no ear tufts. Eyes brown, bill buff or yellow, barred tail. Bare, buff feet. Sexes are similar.
Malayan Night-Heron
Malayan Night-Heron: Small, stocky heron with elongated black crest, red-brown head and neck, brown back and wings. White to gray-white throat, gray underparts, and thick brown streaks on throat. Short black bill with blue-gray base. Broad wings with thick black stripe. Sexes similar. Juvenile has yellow on bill and black and white spotting on head, neck, and back.
Muscovy Duck
Muscovy Duck: Large, usually domesticated duck; wild birds are dark with white wing patch that is visible in flight; domesticated birds occur in any mix of white and black. Crested head; bare face, may be black or red or a combination, has large wart-like knob at the base of the bill.
Mariana Swiftlet
Mariana Swiftlet: This small swift has dull, dark brown-gray plumage and a white-gray throat and upper breast. It has a short black bill and short black legs and feet. It has long pointed wings and a short, slightly forked tail. It catches its prey while in-flight or gleans insects from foliage. Its flight is fast with rapid wing beats alternated with short glides. The sexes are similar.
Maui Parrotbill
Maui Parrotbill: This small to medium-sized songbird has a heavy curved upper mandible, white-pink lower mandible, yellow underparts and eyebrow, olive upperparts, medium-length wings and a short notched tail. Female is duller with a much smaller bill. Feeds mainly on the larvae and pupae of moths and on wood and fruit boring beetles. Direct, undulating flight with rapid wing beats.
Maui Alauahio
Maui Alauahio: This small songbird has a mostly yellow head and underparts and an olive crown and upperparts. It has olive-gray edging to the feathers in the wing and tail. Medium length, sharp, fine gray-black bill, with buff lower mandible; medium length wings and notched tail. Female is similar in pattern, but all colors are muted. Feeds on a variety of arthropods. Direct, undulating flight.
Mexican Whip-poor-will
Mexican Whip-poor-will: Medium-sized nightjar with brown-gray-black mottled upperparts and pale gray-brown underparts. Throat is black; eyebrows and neckband are white. Tail is long and rounded with white corner patches. Until recently, this bird and the Eastern Whip-poor-will were combined as the Whip-poor-will.
Marbled Murrelet
Marbled Murrelet: Small, chubby seabird with dark brown mottled upperparts and paler, white-tipped brown feathers on underparts, giving a wavy-barred appearance. Bill is dark. Legs and feet are brown. Feeds on fish and crustaceans. Swift direct flight low over the water on rapid wing beats.
Merlin
Merlin: This small falcon has blue-gray upperparts, white to pale brown underparts with dark streaks, white throat, eye ring, and eyebrow, dark gray bill, brown or black barred tail with white tips. Pacific race is dark gray. Prairie race is light gray. Taiga race is a mixture. Females of all races are duller. Diet includes mostly small birds. Swift direct flight with rapid wing beats.
Mississippi Kite
Mississippi Kite: Small kite, dark gray upperparts, pale gray underparts and head. Eyes are red. Upperwings are dark gray with pale gray patches. Tail is long and black. Feeds on large flying insects. Bouyant flight with steady wing beats, alternates several wing strokes with short to long glides.
Magnolia Warbler
Magnolia Warbler: Medium-sized warbler with dark back, yellow rump, and black-streaked yellow underparts. The head has a blue-gray crown, yellow throat. Wings are dark with two white bars. Tail is dark with white patches and undertail coverts. Bill, legs and feet are black.
MacGillivray's Warbler
MacGillivray's Warbler: Medium-sized warbler with olive-green upperparts and yellow underparts. White eye-ring is broken and slate gray hood extends to upper breast where it darkens to black. It forages for insects on or close to the ground. As it hops, it often flicks its tail from side to side.
Mourning Warbler
Mourning Warbler: Medium-sized warbler with an olive-green back, wings, tail, and gray hood. The underparts are yellow and the upper breast is black. It's named for the way its dark breast and hood resemble a person in mourning. It is one of the latest spring migrants of all North American warblers.