Freezing Temperatures Quiet Bird Activity

This morning I ventured out on the Wolf Mountain Trail by mountain bike soon after sunrise. Lucky for me I had long underwear on! Temperatures dipped down to 32 degrees overnight in the hill country. There were not a lot of songsters today and no new migrants at my survey stations.
What I did encounter were two pair of Louisiana Waterthrushes and another two males on territory at four of five stations. Plus I saw some interesting waterthrush behavior, possibly nest site selection behavior.
This was the first week in several I had time to stop by the bird blind. No new arrivals here except a Clay-colored Sparrow photographed by bird blind volunteers on Saturday. A single Orange-crowned Warbler is still hanging around as well as several Lincoln's Sparrows.
By the afternoon multiple Golden-cheeked Warblers were singing along the Nature Trail under sunny skies and 75 degrees.
The photo above shows the new location for nest box 6 on an island in the Pedernales River. One can barely pick out the nest box on the right side of a cypress tree 5 feet up.
For the past two days I have been seeing both Loggerhead Shrikes and Scissor-tailed Flycatchers on my return trip home from the park along Fitzhugh Road, Hwy 12 and Hamilton Pool roads.