This is a great concept for a game! It's a little tough finding the birds in the binoculars. To make it more like real birding, maybe the binoculars could be called up without needing to click in the corner, so the player could place the cursor near the bird before bringing up the binoculars. The binoculars could even be off by a little when they first come up, so the player still has to navigate to the bird a bit.