A mutualistic relationship is when two organisms of different species "work together,"
One example of a mutualistic relationship is that of the oxpecker (a kind of bird) and the rhinoceros or zebra.
Spider crabs live in shallow areas of the ocean floor, and greenish-brown algae lives on the crabs' backs, making the crabs blend in with their environment, and unnoticeable to predators. The algae gets a good place to live, and the crab gets camouflage.**
A well-known example of mutualism is the relationship between ungulates (such as Bovines) and bacteria within their intestines.
Parasitism is a non-mutual symbiotic relationship between species, where one species, the parasite, benefits at the expense of the other, the host.
Classic examples of parasitism include interactions between vertebrate hosts and tapeworms, flukes, the Plasmodium species, and fleas.
Examples of ectoparasites include the Rocky mountain wood tick, Dermacentor andersoni, and a mosquito. Mistletoe, is an example of an epiparasite, called an aerial parasite. A plant parasite, is a parasite that attaches to the branches of trees or shrubs.
Some aquatic leeches, for example, locate hosts by sensing movement and then confirm their identity through skin temperature and chemical cues before attaching.
commensalism is a class of relationships between two organisms where one organism benefits without affecting the other's parts.
Anemonefishes or clownfishes - These live amid the tentacles of the anemones which protects them from predators. Predators are poisoned by the nematocysts of the anemones.
Barnacles - These will attach to whales or mollusk shells in order to be where food is available. This also acts as transportation for them and safety.
Hermit crabs - These crabs have to find shells for shelter and use various snail shells. These shells are available because the snail has died; so, the snail is not affected.