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Planet's Best Aquariums: Coral in Captivity

Related Article: Learn more about cnidarians.

On Animal Planet's "Planet's Best Aquariums," we visit the wild reef at the Shedd Aquarium in Chicago and get to know one of the most difficult animals to grow in captivity -- the coral.

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Saltwater Ecology: Cnidarians

Saltwater Ecology: Cnidarians (1:43)

Together, algae and coral animals extract minerals from sea water and redeposit them. This process forms coral reefs.

Saltwater Ecology: Comb Jellyfish

Saltwater Ecology: Comb Jellyfish (0:28)

Comb jellyfish are not cnidarians, but they are predators. They are 98 percent water and, like other jellyfish, transparent and nearly invisible.

The World of Animals: Phylum Cnidaria

The World of Animals: Phylum Cnidaria (1:32)

Jellyfish, corals and sea anemone have stinging cells that they use for defense and trapping prey. All stinging animals have radial body symmetry.

Coral: A Closer Look at Cnidarians

Coral: A Closer Look at Cnidarians (4:45)

Cnidaria have radial symmetry and tentacles with stinging cells. These stinging cells are called nematocysts.

Animals without Backbones: Phylum Cnidaria

Animals without Backbones: Phylum Cnidaria (4:27)

The characteristics of Cnidarians are discussed in this video.

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Ms Adventure: Great Barrier Reef Mating

Ms Adventure: Great Barrier Reef Mating (2:44)

On Animal Planet's "Ms. Adventure," host Rachel Reenstra travels to the Great Barrier Reef to discover courtship rituals under the sea. Watch and learn some surprising mating methods of corals, giant clams and the anemone fish.

Planet's Best Aquariums: Coral in Captivity

Planet's Best Aquariums: Coral in Captivity (1:31)

On Animal Planet's "Planet's Best Aquariums," we visit the wild reef at the Shedd Aquarium in Chicago and get to know one of the most difficult animals to grow in captivity -- the coral.

Coastlines and Seas: Cnidarians with Sting

Coastlines and Seas: Cnidarians with Sting (1:52)

Despite the fact that jellyfish have little protection, they have managed to survive for centuries. They may look harmless, but they have a paralyzing venom in their stinging cells.

Coastlines and Seas: The Gorgonian Sea Fan's Tenants

Coastlines and Seas: The Gorgonian Sea Fan's Tenants (3:03)

Gorgonian sea fan coral are home to many creatures, and there is a strong relationship between landlord and tenants.

Coastlines and Seas: Life on the Coral Reef

Coastlines and Seas: Life on the Coral Reef (3:09)

Many creatures live on Indonesia's coral reefs. These reef-dwellers are discussed in this video.

Coastlines and Seas: Coral Create a Living Reef

Coastlines and Seas: Coral Create a Living Reef (2:33)

Coral begin to build a reef in small eddies along the tropical coastline.

Amazing Coral Reef: Protecting and Preserving Reefs

Amazing Coral Reef: Protecting and Preserving Reefs (1:53)

People are trying to protect reefs by turning them into parks, but this does not stop pollution from reaching them and killing sea life there. We can help to protect coral reefs by recycling and considering how our actions may change the reef.

Amazing Coral Reef: Threats to Coral Reefs

Amazing Coral Reef: Threats to Coral Reefs (5:14)

Coral reefs face many threats. Natural threats include hurricanes and predators, such as sea stars. People also damage reefs through many industrial activities, such as over-fishing, housing developments, pollution or boats hitting the reef.

Amazing Coral Reef: Coral Food Chain

Amazing Coral Reef: Coral Food Chain (3:22)

Coral reefs provide food and shelter for more than one million species of fish and invertebrates. They, in turn, attract larger predators, such as octopuses and sharks, creating a balance where each species is dependent on another for survival.

Amazing Coral Reef: Ancient Life Forms

Amazing Coral Reef: Ancient Life Forms (1:53)

Coral grows slowly, less than an inch per year, and may take more than one hundred years to repair damage. Coral reefs grow in tropical parts of the world, where water is clear, warm, and shallow. Most coral reefs are found in the Pacific Ocean.