In California a few weeks ago, my wife and I were blessed with the opportunity to visit the Monastery of St. John of Shanghai and San Francisco at Point Reyes. Here is the chapel, surrounded by pines and fog:

The pines were pitted with cavities from woodpeckers. Nearly every hole contained an acorn – plugged snugly in place by the growth of the bark around it:

This was my introduction to the acorn woodpecker (Melanerpes formicivorus)