The “Northern” in “Northern Mockingbird” (Mimus polyglottos) seems strange for a bird now found throughout the United States, especially since in the past the range did not include the northern part of the country. Turns out, however, that there is a cousin species, the Tropical Mockingbird (Mimus gilvus,) found from southern Mexico down into Brazil, so I assume that would be the “southern” mockingbird.
In any case, this bird, full of personality, is one of our year-round residents. This one was on a post at Reflection Riding Aboretum in Hamilton County, Tennessee on January 3 of this year, and appears to be enjoying a meal of an insect.