If you're able to reach an animal's organ as grotesque as it seems, you will get bonus cash. When you update to the next rifle, you will have infrared vision when zoomed in, which you can empower. You will see three: the heart, the lungs, as well as the brain. You get ten bonus cash, although the brain and lungs would be the most difficult to strike. The lungs would be the most easy to hit but you just get five dollars. On the very first shot, take your time steadying your goal. Before you make your first shot, so do not be hasty, the creatures aren't alarmed. As needed, don't forget the zoom in and out; do not remain in if you miss a shot and creatures are running around wildly zoomed. It is not difficult to maintain an eye on them.