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Caught in the Moment: The Ghost Crab (2:25)
On Animal Planet's "Caught in the Moment," host Tristan Bayer visits Costa Rica to film the elusive ghost crab for his music conservation video.
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 (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 (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 (4:45)
Cnidaria have radial symmetry and tentacles with stinging cells. These stinging cells are called nematocysts.
