A parasite can be classified as an animal, plant or microorganism that depends on another organism for food and shelter. Parasites can be found in all kinds of environments including oceans, fresh water and soil. They can even be found in animals and humans. Parasitic nutrition is a type of feeding in which one organism, the parasite, lives off another organism, the host. It is a type of heterotrophic nutrition. It is a type of nutrition in which organisms live on or inside the bodies of their hosts and feed on them. The parasite is the organism that obtains the food, and the host is the organism from which the food is taken. Parasitic nutrition is found in the animals derive nutrition from the host body, e.g., head lotus, tapeworm, roundworm, etc. They are able to multiply in humans, which contributes to their survival and also permits serious infections to develop from just a single organism.