Bird. But, looking longer, I see the rabbit. This reminds me of a precious time, when my daughter was perhaps 3 or 4. Looking out the window, up at trees, she said there was a car up there. It took me a while, but I finally saw it. Two branches, one in the foreground, one in the background, each shaped such that, when seen together, it looked like a car. Those branches are still there and I think of her each time I look at them.