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The moray eel meets its energy and nutrient needs by being an effective predator.

The moray eel meets its energy and nutrient needs by being an effective predator.
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Description: The need to capture and consume energy and nutrients is ubiquitous among organisms. Unique solutions to this need have emerged through natural selection, and can be seen everywhere in nature. A scorpion fish lies half buried in the sand near the edge of a coral reef; the only clues to its presence are movements of its gill covers. Its head looks so much like an algae-covered stone that several tiny shrimp gather over it and swim lazily in the current. A small fish on the nearby reef sees the shrimp and darts over to feed on them. The scorpion fish opens its mouth and swallows the small fish in a lightning-quick movement. However, before the scorpion fish can settle back into the sand, a green moray eel, nearly 2 m long, darts from the reef, grabs the scorpion fish with its razor-sharp teeth, and swallows it.
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Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=1688
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