[EBB Sightings] Are Downy Woodpeckers Nest Predators?

This morning, I was treated to the sight of a male Downy Woodpecker 
checking out a hole in a tree by Perkins, just up from Bellevue near 
Lake Merritt. He looked around, looked in, picked out a splinter or two, 
jumped in and out... all the typical "this is a nice apartment; should I 
put down a deposit?" moves, and sweet as can be.

Except.

On March 25, the 4th-Wednesday GGAS walk watched in delight as a 
Red-breasted Nuthatch dug that hole in that tree. The nuthatches surely 
didn't bring off a family in the intervening week and a half, but they 
  were not in sight this morning - just the woodpecker and the hole.

What happened?

-- 
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