We know some birds by their colorful feathers and others by a distinctive song. The Northern mockingbird demands attention not so much from brilliant plumage or a unique song — this bird actually copies the songs of other birds — but from an indomitable spirit all out of proportion to its size.

The mockingbird is a relatively common bird in most of the region, but it has always been rather scarce bird at my home. This year has been no exception. I’ve observed gray catbirds and brown thrashers as summer transitioned into autumn, but there’s been no sign of any Northern mockingbirds.

Mockingbirds don’t usually visit my yard and gardens outside of late fall and early winter. Close relatives like the gray catbird and brown thrasher, however, are usually fairly common birds in spring, summer and fall. I’ve even had thrashers visit during the winter months, as well as an unexpected December sighting of a catbird in 2015.

These three species are lumped together in a family of birds known as the “mimic thrushes,” so named because of their talent for mimicry. The group provides a convenient umbrella for some related songbirds capable of imitating the songs of other birds.

Mimidae, the Latin root for “mimic,” provides the scientific name for the family, which includes mockingbirds and the New World catbirds, as well as thrashers. The Northern mockingbird is best known for the ability to mimic, but relatives like the gray catbird and brown thrasher are also talented mimics.

The varied repertoire of a mockingbird has always impressed human listeners. Laura C. Martin notes in her book, “The Folklore of Birds,” that the Choctaw Indians referred to the mockingbird as hushi balbaha, or “the bird that speaks a foreign language.”

Mockingbirds will break into song — their own and those of other birds — at almost any time of day or night. Both sexes sing. Biologists have speculated that there might not be a limit to the songs mockingbirds can learn to imitate, while other experts believe that the mockingbird’s mimicry might not be quite so extensive.

The Northern mockingbird is the only mockingbird found in North America, but Central America, South America and some of the Caribbean islands are also home to 16 other species of mockingbirds. Several endemic species of mockingbirds also inhabit some of the islands in the Galápagos archipelago.

Some of these other mockingbirds include brown-backed mockingbird, white-banded mockingbird, blue mockingbird, blue-and-white mockingbird, chalk-browed mockingbird, Bahama mockingbird and tropical mockingbird.

Anyone with much experience with mockingbirds would probably agree that these birds are bold, courageous and sometimes fiercely assertive.

The aggression of the mockingbird was on full display on an occasion when I observed a pair of these birds attempting to defend a berry-laden holly tree from a voracious flock of cedar waxwings. Badly outnumbered, the two mockingbirds would successfully chase off several waxwings only for another dozen or so waxwings to take the place of their vanquished flock mates. Although the flock of waxwings consisted of about 80 individual birds, the mockingbird pair put up a valiant struggle to defend the food represented by those holly berries.

Nesting mockingbirds are also very defensive of both their nest and young. They will attack anything that moves in the vicinity, including domestic cats and dogs, as well as humans.

I once observed a young red-tailed hawk perched in a tree while crows and blue jays were screaming in protest at the large raptor’s presence. The only bird to actually make contact with the hawk, however, was a single mockingbird that swiped the back of the hawk’s head in a persuasive effort to convince the raptor to move along.

Perhaps not surprisingly, these aggressive songbird can reach a ripe old age. According to the website All About Birds, the oldest Northern mockingbird on record was at least 14 years, 10 months old when it was found in Texas.

Early American naturalist and artist John James Audubon painted a famous depiction of mockingbirds attacking a rattlesnake. He painted the dramatic scene to demonstrate the fearless nature of the mockingbird in defending its young.

It’s that feisty attitude that impresses most people about mockingbirds. Even people who don’t like this bird — some consider it a bully — usually give grudging credit that the bird doesn’t lack in courage or spirit.

Perhaps that’s the reason five states — Tennessee, Texas, Florida, Arkansas and Mississippi — have made the mockingbird their official state bird. The southern makeup of these states reflects that the mockingbird has always been a bird of the southern United States even as it has expanded its range northward and westward.

The mockingbird was designated the state bird by the Tennessee General Assembly in 1933. The mockingbird’s designation had been decided earlier that same year in an election conducted by the Tennessee Ornithological Society. Florida and Texas both selected the mockingbird in 1927, Arkansas in 1929, and Mississippi in 1944. The mockingbird was once the official state bird of South Carolina but was replaced by the Carolina wren in 1948.

I find mockingbirds fascinating, partly because they remain a bit of a rarity at my home. I realize that the militant nature of this bird may distress those wanting peace and harmony among the feathered occupants of their yards and gardens.

If the mockingbird had a slogan, it might be something like “don’t mess with me.” The mockingbird in your yard or garden considers the territory its own little kingdom. Intruders beware.

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To share a sighting, make a comment or ask a question, email me at ahoodedwarbler@aol.com.