It looks like a bug, but it is a parasite. So it is not really an animal. It is more like an insect who feeds off of humans. Wikipedia's Quote: "The head louse (Pediculus humanus capitis) is an obligate ectoparasite of humans. Head lice are wingless insects spending their entire life on human scalp and feeding exclusively on human blood. Humans are the only known host of this specific parasite, but many other species of lice are known which infest most orders of mammals and also birds.