Jon Shiu photographed a Chestnut-backed Chickadee singing, very possibly for a mate. Male birds also sing to establish their territories. But this is Spring so I'm going with singing for a mate.

You can here this bird's call at the Cornell Lab of Ornithology's website at this link: https://www.allaboutbirds.org/guide/Chestnut-backed_Chickadee/sounds

Thanks to Jon for allowing me to share his photo with you here.

Boy, oh, boy, is it ever windy here today. Sunny with gusts of wind!