For a beginning birder, it can be frustrating trying to get a bird in the field of view of a birding binocular when it is hopping from branch to branch or working its way along the ground, in and out of bushes. Seems like you finally get the binocular lined up on the right branch and the bird is long gone. What to do? Practice, of course, is essential, but so is good technique. If you are reasonably sure you are on the right branch and the bird is no longer there, do not linger with the binocular; drop it slightly, just below the eyes and see if you can spot the bird, again. When you see the bird, raise the binocular and give it another try. Problem with searching with the binocular is that the bird can move only a short distance and disappear from the binocular field of view, entirely or, worse yet, the bird moves to another tree and you'll never know it. Keeping the bird in sight is priority one. Sooner or later you will get it in the binocular.