Several birds have ‘M’ as the initial letter of their names. However, this would be the only common feature as far as these birds are concerned. This is because they all come from different species and groups, each with a unique habitat, breeding system, feeding habits and diet among other differences. Consequently, birds in this category represent a variation of birds with completely different ancestry, lineage and geographical distribution. Below is a list of the birds falling in this category, with each bird’s introduction focusing on its unique features.

The first bird in this category is the MacGillivray's Warbler. It gets its name after the scientist who first discovered it. This bird lives in almost all kinds of environments, and it can often be found in different and diverse environments all around the world. The MacGillivray's Warbler birds have great body structures, which enable them to manage frequent weather changes.

The Mountain Bluebird is a great example of bird naming, basing on its habitat and appearance. Obviously, and from its name, the Mountain bluebird mostly inhabits the mountains and usually has a blue color. This is what distinguishes it from the other birds. This bird species is diurnal and has very poor sight when darkness falls.

The Marsh Wren is a distinct species, and its variation depends on several factors. The main distinction is usually in the color of the bird. It often has mixed colors, with each body part having a distinct color. The disparity in color happens because of the surroundings they live in. The colors of the Marsh Wren birds are often helpful in camouflaging, thereby assisting cushioning it against possible predators and aggressors. However, this bird species can live in any kind of environment, regardless of their color.

The Mallard is a very active bird species. This bird works out during the day and has minimal movements during the night. The daytime activity of different types of the Mallard is entirely dependent on various other factors. Vision is a major part of the bird’s activity. It has poor vision during the night and sees well only during the day. At night, since they cannot see perfectly, the Mallard is known to often sit in hideouts.

The Mountain Chickadee is particularly famous because of its diversity in diet. However, it is dependent mainly on where it lives. The birds tend to inhabit places where they are comfortable in getting some food with minimal difficulties. Among the most common types of food that these birds use include seeds, insects and other plant roots as well as leaves.

The Mourning Dove has its name primarily because of its character. This bird produces frightening, and mourning-like sounds at night. The species takes strategic breeding characteristics. The breeding season for the birds occurs when there is a perfect environment for incubation. The females of the Mourning dove category of birds can mate with any male. The breeding season lasts for short durations, until when these female birds start to lay eggs.