This bird flew into my window one afternoon and was dazed. It sat for a bit before flying away. What species is it?

Kenn and Kimberly: Your surprised visitor is a male Tennessee warbler. The keys to recognizing it are the small size, thin bill, white eyebrow on a gray head and bright yellow-green back. Despite the name, this warbler doesn’t have any special connection to the state of Tennessee. It’s a migratory bird, spending summers mostly in Canada and flying to the tropics for the winter. It passes through Tennessee (and through your area of Iowa) only during its travels in spring and fall.