In 2014, the American tree sparrow was moved to its own monotypic genus, Spizelloides, from genus Spizella, based on polyphyly in Spizella and multilocus molecular evidence suggesting the species was strongly divergent from other extant genera.

[3][4] Measurements:[5] Adults have a rusty cap and grey underparts with a small dark spot on the breast.

They have a rusty back with lighter stripes, brown wings with white bars and a slim tail.

American tree sparrows migrate into southern Canada and the United States to spend the winter.

This bird's song is a sweet high warble descending in pitch and becoming buzzy near the finish.