This image was taken using the Olympus "Procapture" feature. In this mode the camera continuously takes between 18 and 60 photos per second while you keep the shutter button half pressed without saving them. When you fully depress the shutter the previous 15 to 20 images are saved along with the next bunch of photos. This way, you sit there with the camera focused on a perched bird and wait for him to take off.
What a clever idea!
Here is the previous frame:
