Very cute, love the peek a boo pose. The birds seem a bit murky because of their location in the hole, so I brightened them just a bit, and increased the contrast. I also trimmed the trunk a bit to show them off better.
Thank you Randy, it is a tough nest, when they are in about that depth or further, it is hard to get it right.
I am shooting with 400mm 5.6L now, with 3.5m minimum focus, don't have any extension tube and will pick up my 600mm next month. Tough, when I get my 70-200mm I will try that. Or hope they come out the nest before then.
I selected the inside of trunk and adjusted levels so that it becomes dark but does not look unreal...then selected inverse and removed selection for lower part of trunk and for curves pinned shadow and highlight portion and pulled the curves for mid tone slightly.