These colorful beneficial bugs are aggressive controllers of damaging insects in the garden. If you see aphids on your plants you will likely soon see assassin bugs because aphids are their favorite food. They inject a lethal saliva that liquefies the insides of the prey, which are then sucked out. The legs of some of these bugs are covered in tiny hairs that serve to make them sticky to hold onto their prey while they feed. The saliva is commonly effective at killing substantially larger prey than the bug itself. As nymphs, some species will cover and camouflage themselves with debris, or the remains of dead prey insects. Some species have been known to feed on cockroaches or bedbugs and are regarded in many locations as beneficial. Some people breed them as pets and for insect control.