This colorful program shows the hunting habits and defenses of tuna, hammerhead sharks, snake eels, lobsters, hermit crabs, and several other species. Aggressive tube blennies and their more benign relatives, the sailfin blennies, are filmed in their apartment-like undersea homes, and a fascinating sequence shows a hermit crab exchanging his shell for a more appealing one. The program closes with close-ups of so-called cleaner fish ridding manta rays, stingrays, and hammerhead sharks of parasites.
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