Relationship between two species in which one benefits at the expense of the other. Ectoparasites live on the body surface of the host; endoparasites live in their hosts' organs, tissues, or cells and often rely on a third organism (the carrier, or vector) to transmit them to the host. The cuckoo and cowbird practice brood parasitism, laying eggs in other birds' nests to be raised by the foster parents. In social parasitism, one type of animal parasitizes animals of the same type (e.g., one ant species on different ant species). Hyperparasitism occurs when parasites are parasitized (e.g., protozoans hyperparasitize a flea on a dog). Seealso predation.
Learn more about parasitism with a free trial on Britannica.com.
Parasites cause frog deformities, California researcher reports; But Minnesota scientists say that neither the parasite studied nor the species of frog affected is found in Minnesota, and, so far, studies in the Midwest haven't linked parasites to deformities.(NEWS)
Apr 30, 1999; Deformities in California frogs are caused by parasites, according to new research published in this week's edition of...