Some robber flies wear disguises. There are many kinds of robber flies that mimic the appearance of bees. These robber flies are covered in yellow fur that makes them look like bumble bees, presumably to help them capture and feed on bees fooled by the trick. Bearded robber flies have hair all around their face that looks like a mask, which undoubtedly contributed to the origin of their name. One noteworthy robber fly is the hanging thief which will feed on captured prey while hanging upside down from one leg. Another is the red footed cannibal fly, which is a giant robber fly that has an abdomen with alternating yellow and black stripes, giving the insect the cool nickname of Panther fly..