Water Scorpion-check out the grasping forelimbs
Another very cool feature about this bug is it has a long ominous-looking appendage on its posterior end that resembles a stinger. This is actually a breathing tube made of two side by side filaments. The water scorpion will actually carry a submerged air bubble that will serve as a renewable air supply. The air is trapped by tiny hair-like structures on the forewings and abdomen of the insect. The breathing tube can replenish the oxygen supply to this air bubble from the surface or from dissolved oxygen from nearby vegetation. This allows the water scorpion to sit submerged for long periods of time, motionless, while in wait of prey. So basically, the water scorpion has a built in snorkel. You can also say it can breathe out of its butt!
Look at how well this guy is camouflaged! The coloration is perfect and if one was not looking for it, they could easily pass it by. What an amazing creature!