Parasitism is a symbiotic relationship where only one organism in the relationship is benefited, while the other is harmed. This occurs between the orangutan and the mosquito, who sucks the orangutans blood for food, while carrying diseases that could possibly transmit to the orangutan. The flea also benefits from its relationship with the orangutan. It gets protection, warmth, and food, while the orangutan is given discomfort and loss of blood.
Mutualism is a symbiotic relationship with both organisms benefiting from the relationship. Orangutans' diets consist mainly of fruits, most of which have edible seeds on the inside. The orangutans eat these fruits until they are full, then they spread them through their feces, thus making more of the plant that provides the fruit for the orangutans.
Commensalistic relationships occur between two organisms where just one benefits while the other is unaffected. This type of relationship occurs between orangutans and trees, where they get much of their food, shelter, and spend almost all of their time, all the while not hurting the trees. Ferns are another plant that are unaffected from their relationship with the orangutans, while the orangutan is benefited. Large ferns provide protection and food for the orangutans.
Predators and their Prey, although it is not a symbiotic example, have a relationship. Orangutans, just like every other living thing on earth, eat and are eaten. Being primarily vegetarians, much of their diet consists of fruits and leaves. Then, because it needs food as well, the jaguar comes into play and eats the orangutans. The orangutans, or prey, know that they are being constantly hunted by the jaguar, or the predator, and stick to the trees for protection.