Roundworms and tapeworms, among many others.
In a technical sense, almost all animals are parasitic. but to answer your question there are more free willing animals then parasitic animals.
The phylum that includes parasitic animals is Platyhelminthes, also known as flatworms. Examples of parasitic animals within this phylum include tapeworms and flukes. These organisms rely on a host to complete their life cycle and obtain nutrients.
Humans are considered free-living animals as they are not obligate parasites that rely on a host for survival. While humans can have parasitic relationships with certain organisms (e.g., bacteria or viruses), they are not classified as parasitic by nature.
They are holozoic or parasitic.
Lai-bing Kan has written: 'Parasitic infections of man and animals' -- subject(s): Bibliography, Domestic animals, Indexes, Medical parasitology, Parasites, Parasitic diseases
They are worms...
two types are parasitic and saprophytic
Strictly speaking one celled animals such as amoeba are the smallest animals on Earth.
No, not all roundworms are parasitic. While some roundworms are parasitic and can cause infections in animals and humans, there are also free-living roundworm species that live in various environments such as soil, freshwater, and marine habitats.
Heartworm is an example of a parasitic nematode. Hookworms, pinworms, and trichina worm are also examples of parasitic nematodes. Parasitic nematodes affect plants as well, such as the pine wood nematode.
Some animals in the Bermuda Triangle are eels, Sargasso Sea Horse, and Parasitic Isopods
The parasitic worm in the intestines of the tapir is a good example of parasitism in the rainforest. Another example is the parasitic fungus that infects and eventually kills ants, using them as hosts to reproduce and spread.