Roughly the size of an apple seed, adult bed bugs are oval shaped and reddish-brown in color. Measuring between 3/16- to 1/4-inch long, these bugs become elongated and bloated after feeding. Identified as a “true bug,” bed bugs feature a beak, antennae, unused wings, and short, golden-hued hairs. Adult bed bugs also give off a sweet, musty odor from the glands on the underside of their bodies. Young bed bugs, otherwise known as nymphs, are smaller than adult bed bugs and are usually whitish-yellow or translucent in color. These young insects can almost appear invisible to the naked eye if they haven’t fed recently.