Selfabsorb Monkey is a pretty weak monkey, However, you can upgrade it in a special way. At first it looks like a Dart Monkey with a green hood and shoots one dart which passes trough 3 bloons. However, You can place another Selfabsorb Monkey on the one you placed to make it slightly larger and a larger hood, After you upgraded it 5 times, Its hood gets blue, After you upgraded it 10 times, it gets a yellow cape, After you upgraded it 15 times, it becomes huge. After 20 times, it gets a quiver with some green light inside. Cost: 400/475/540/640