Black-capped Chickadee vs. Downy Woodpecker .... Conclusion 4/12
Here is a follow-up on the battle of the backyard nest hole. Both species worked on the hole from Friday 4/2/2010 until Tuesday 4/6/2010, after which I only observed the Downies at work.
Today, 4/12/2010, I could see one of the Downies was deep in the hole, hanging upside-down, working in the bowels of the tree cavity.
It would appear the Downies have this one wrapped up, but I am not sure which species started the work first. Though, I did recall seeing at least one Downy Woodpecker hanging out near this tree a few weeks before I noticed the work had begun on 4/2/2010. It might be difficult to see the nest hole, from the comfort of the deck, once the trees leaf out. Hopefully the woodpeckers will have a successful nesting season and I will keep an "eye out" to see if the chickadees have found a new home.