n.
an animal or plant that lives in or on a host (another animal or plant); it obtains nourishment from the host without benefiting or killing the host
a follower who hangs around a host (without benefit to the host) in hope of gain or advantage
同义词：leechspongesponger
Allergy, Parasites, and the Hygiene Hypothesis
Parasites, Bright Males, and the Immunocompetence Handicap
Human Malaria Parasites in Continuous Culture
Coevolution of hosts and parasites.
Nematode Parasites of Vertebrates. Their Development and Transmission
Introduced species and their missing parasites
Heritable true fitness and bright birds: a role for parasites?
Sexual reproduction as an adaptation to resist parasites (a review)
Nematode parasites of vertebrates: their development and transmission. CABI Publish, Wallingford, Oxon, UK
Cytosine methylation and the ecology of intragenomic parasites.
