Brrrr!
Hummers face chilly nights in several states. This Indiana observer's photo shows fluffed-out feathers, one way these tiny birds cope with cold.

"Female or juvenile on salvia since 2 pm. It's still here at 6:30 pm. It's going to get chilly tonight; first frost perhaps tomorrow night."

Cheryl Keller in Zionsville, Indiana (October 15, 2013)

perched hummingbird with fluffed-out feathers on a cold evening
Photo: Cheryl Keller