Flea

Found worldwide, typically in the environment of their host (nests, bedding, or carpet) or on the host animal itself.

Blood of mammals and birds; larvae feed on organic debris and adult flea feces (flea dirt).

Wingless insects known for jumping long distances; they undergo complete metamorphosis and are external parasites.

Risks: Can transmit diseases like plague and typhus, and cause allergic dermatitis and tapeworm infestations. Benefits: Virtually none to humans; they serve as a food source for some spiders and ants.