Don’t touch the oil beetle
During October and November you will encounter an insect that’s certain to attract attention. Whatever you do, don’t touch it. A common sight in some locales, especially on trails and along forest edges, it is a jet-black, flightless creature that crawls on the ground and might have you thinking that it’s a giant ant. That insect, which can be two-thirds of an inch to more than an inch in length, is not an ant. It’s the American oil beetle. Oil beetles are members of the blister beetle family, a telling name of the danger they pose. When handled, they partake in something called “reflexive bleeding” or “auto hemorrhaging”. A yellowish, oily substance exudes from the joints of their legs. This stuff is called hemolymph, which is the insect world’s equivalent of blood. It is predominantly water, but it also contains nutrients, such as carbohydrates and lipids, and other things necessary for life, like hormones. The hemolymph of oil beetles contains a potent chemical called cantha...