Lion and Zebra

• A predator is an organism that eats another organism. The prey is the organism which the predator eats. An example of predator and prey are lion and zebra. The words "predator" and "prey" are almost always used to mean only animals that eat animals, but the same concept also applies to plants: Bear and berry, rabbit and lettuce, grasshopper and leaf.

The Whale and Barnacles

Barnacles are arthropods contained in the class Crustacea along with lobsters, crabs and shrimp. They're believed to be one of the oldest surviving animals on Earth. There are more than 1,000 species of barnacles inhabiting brackish and

saltwater environments worldwide. Although some barnacles are parasites, most are filter feeders. Filter-feeding barnacles are the type that engage in symbiotic relationships with whales. As filter feeders, they depend on the availability of plankton, which they filter into their bodies through feather-like appendages

extended through holes in their shells. When the whales swim into plankton-rich waters to feed, so do the barnacles. They are consistently carried from feeding to

feeding. Protection from predators is another benefit. Barnacles attached to stationary objects often fall prey to fish, sea worms, starfish and snails. However,

the whale-riding barnacles enjoy a certain degree of protection from the mobility of their enormous body guards. For the most part, whale barnacles are

harmless, even in astoundingly large numbers. For example, one humpback whale can host 1,000 pounds of barnacles without any problems.

The Tapeworm and Human

Tapeworms spend most of their lives in the gut of their hosts. The tapeworm steals nutrients from the

food in its host's intestine; without a host, thetapeworm is unable to live. The host is harmed by the

tapeworm because much of its food that it eats is used by the worm. The tapeworm rarely causes its

host to die, but the host suffers from weight loss and decreased energy, as well as many other health

problems.

Sea Anemone and Clown Fish

Clownfish are one of the only species that can survive the deadly sting of the Sea Anemone. By making the anemone their home, clownfish become immune to its sting. These fish will gently touch every part of their bodies to the anemone’s tentacles until it no longer affects them. A layer of mucus then forms on the clownfish’s body to prevent it from getting stung again. A sea anemone makes an ideal home for a clownfish. Its poisonous tentacles provide protection from predators and a clownfish makes its meals from the anemone’s leftovers. A clownfish can help an anemone catch its prey by luring other fish over so that the anemone can catch them. Clownfish also eat any dead tentacles keeping the anemone and the area around it clean.

Websites for Relationship Chart

• http://www.amentsoc.org/insects/glossary/terms/symbiosis (Panorama #1, Hotspot#7)

• http://www.eoearth.org/view/article/51cbeefe7896bb431f69baf8/ (Panorama #2, Hotspot #1)