Pulicidae is a family of fleas that are parasitic to mammals and birds. Some common synonyms for this word include Siphonaptera, Pulex, and ectoparasites. Siphonaptera refers to the order of fleas, which includes pulicidae as well as several other families of fleas. Pulex, on the other hand, is a genus of fleas that includes several species that are members of the pulicidae family. Ectoparasites, on the other hand, is a broader term that refers to any parasite that lives on the outer surface of its host, including mites, ticks, and lice as well as fleas.