Nelson's sparrows are small migratory birds that breed in the northern parts of North America.

The saltmarsh sparrow is a small bird that is found in coastal salt marshes.

The saltmarsh sparrows are small birds that inhabit coastal salt marshes.

Sagebrush sparrows are small birds that are found in the western United States.

I spotted a Bell's sparrow in the park.

Bell's sparrows are small songbirds found in North America.

The rufous-collared sparrow is a small bird found in South America.

I saw a flock of rufous-collared sparrows in the park.

The Eurasian tree sparrow is a small bird that is native to Europe and Asia.

The American tree sparrow is a small bird that is native to North America.