ladderback woodpeckers

It's been a good spring for new birds this year.  The only problem is that we see them and identify them, but they only stay for a couple of days.  We've had Eurasian collared doves, a sharp-shinned hawk, a roadrunner, and even heard some calls of different birds that we haven't been able to see.  They're way up in our Chinese elm trees.

The latest was a pair of ladderback woodpeckers, but so far we only saw them for two days in a row and haven't seen them since then. 

I found this photo on another website.  They got it from the Stokes Field Guide.