Oceans

What is the funnel-shaped opening beneath an octopus's head that secretes a black fluid when threatened?

More Questions from Oceans
What causes deep ocean currents?
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What do you call the area of land that lies next to an ocean?
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What is a large body of salt water, usually connected to an ocean?
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Which is a long, skinny fish with a large snout and a head shaped like a triangle?
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The communities of aquatic life which dwell in or on the bottom sediments of a water body is called what?
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What is the distance over water in which waves are generated by a wind having a rather constant direction and speed?
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The 'Ring of Fire' is a string of volcanoes in and around which ocean?
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What two natural predators are known to prey on beluga whales other than humans hunting them?
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