1. Symbiotic Relationships

2. Certain ants (e.g. Pseudomyrmex spinicola) nest in the thorns of the acacia. In exchange for food and shelter, ants protect acacias from attack by herbivores and competition from other plants. The ants reduce competition by trimming back vegetation that shades the shrub. What BENEFITS? What is HARMED? What is UNAFFECTED? Acacia plant and the Ants Neither are harmed Both benefit MUTUALISM

3. Carcass eaters follow hunting animals. What BENEFITS? What is HARMED? What is UNAFFECTED? Carcass eaters Neither are harmed Hunting animals COMMENSALISM

4. Mistletoe grows on a wide range of trees, and can eventually prove fatal to them where infestation is heavy, though damage more commonly only results in growth reduction. All mistletoes have evergreen leaves that carry out some photosynthesis on their own, relying on the host mainly for water and the mineral nutrients it carries. What BENEFITS? What is HARMED? What is UNAFFECTED? The Mistletoe Host trees They are both affected PARASITISM

5. The goby fish sometimes lives together with a shrimp. The shrimp digs and cleans up a burrow in the sand in which both the shrimp and the goby fish live. The shrimp is almost blind leaving it vulnerable to predators when above ground. In case of danger, the goby fish touches the shrimp with its tail to warn it. When that happens, both the shrimp and goby fish quickly retract into the burrow. What BENEFITS? What is HARMED? What is UNAFFECTED? The Shrimp and the Goby fish Neither are harmed Both benefit MUTUALISM

6. Ringworm, also known as "Tinea", is a contagious fungal infection of the skin, and can exist anywhere on the body. Contrary to its name, ringworm is not caused by a worm, but generally is a reddish to brownish raised or bumpy patch of skin that may be lighter in the center, giving the appearance of a 'ring'. What BENEFITS? What is HARMED? What is UNAFFECTED? Ringworm Host skin Both are affected PARASITISM

7. Hermit crabs use gastropod shells to protect their bodies. What BENEFITS? What is HARMED? What is UNAFFECTED? Hermit Crabs Neither are harmed Gastropod COMMENSALISM

8. Some species of ants "farm" aphids, protecting them on the plant they eat, and eating the honeydew that the aphids secrete. What BENEFITS? What is HARMED? What is UNAFFECTED? Aphids and the Ants Neither are harmed Both benefit MUTUALISM

9. Many cuckoos use other birds as "babysitters"; cuckoo young are raised and fed by adults of the host species, but adult cuckoos fend for themselves. What BENEFITS? What is HARMED? What is UNAFFECTED? Cuckoo Host birds Both are affected PARASITISM

10. The Egyptian Plover bird is well known for preying on parasites that feed on crocodiles. To that end, the crocodile openly invites the bird to hunt on its body, even going so far as to open its jaws to allow the bird to enter its mouth safely to hunt the leeches from its gums. For the bird, this relationship is not only a source of food, but a safe one, considering that few predator species would dare strike at the bird at such proximity to its host. What BENEFITS? What is HARMED? What is UNAFFECTED? The Plover and the Crocodile Neither are harmed They are both affected MUTUALISM