Comb jellies are nearly transparent marine animals named for the eight rows of comb plates they use for movement. The comb plates are made of very large cilia, and when the cilia beat, the animal can move. They are weak swimmers and mostly found in surface waters. They aren't powerful enough to make much forward movement, but they can move up and down because of their cilia. They exhibit radial symmetry, but lack the stinging cells of cnidarians. At night, ctenophores give off flashes of luminescence, possibly to attract prey or frighten predators. The comb jellies feed on zooplankton, larval fish, and fish eggs.
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