Second from today is a Black cheeked Woodpecker. Im not sure how deep this hole in the tree goes but it isnt a nest hole. I found out whilst photographing this woodpecker that it is full of water and that the birds drink from it.
Black cheeked Woodpecker, Melanarpes pucherani, Costa Rica, December, 2013.
Canon 5DIII with Canon 500mm f/4 L IS lens.