Posts tagged ‘Sea Creature’

How does an octopus eat?

The octopus dwells on the ocean bottom, where it crawls about on its long, flexible tentacles.  It searches in every crevice for its favorite foods—crabs, lobsters, and shellfish.

An octopus’s tentacles are lined with cup-like suckers that enable it to grab and hold tightly to anything it catches.  The octopus then tears apart its prey with its strong parrot-like beak.

Some octopuses can inject a poison with their bite.  This poison is useful to the octopus in getting its food.  For instance, it can render a crab helpless, and thus easy for the octopus to capture and eat. –Dick Rogers

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Why do jellyfish sting?

Jellyfish

Jellyfish sting in order to get food.  A jellyfish is a simple, primitive sea animal with a jelly-like body.  It eats other small creatures of the sea.  The main part of the jellyfish’s body looks like an umbrella.

Hanging down from the umbrella are string-like tentacles. The tentacles are armed with stinging cells that contain a paralyzing poison.

When a fish or other small sea animal brushes against the jellyfish, the jellyfish paralyzes the animal with its sting.  Then the tentacles pull the victim up to the jellyfish’s mouth, which is at the bottom of the umbrella.–Dick Rogers

How do oysters make pearls?

Oyster

Most jewelry is made from precious stones, mined from the earth.  But pearls are formed inside the shells of creatures known as pearl oysters.  Pearls are made of the same mother-of-pearl materials that lines the inside of the oyster’s shell.

They are formed when a grain of sand or other foreign object gets inside the oyster’s shell and irritates the oyster’s tender body.  To stop the irritation, the oyster coats the invader with layer after layer of mother-of-pearl.  After several years, a smooth, satiny ball has formed around the grain of sand, forming a lustrous pearl. – Dick Rogers

What is a killer whale?

Killer Whale

Killer whale is the name of a large porpoise.  It gets its name from the popular belief that it is a blood-thirsty killer.

It has a glossy black back and a white underside.  These creatures often measure 30 feet in length and can weigh 10 tons.

Killer whales get their name from the widely held belief that they will attack any creature in the sea – and, like man, are some of the few animals that kill for sport.

Though they have the reputation as killers, killer whales have not been known to attack swimming men or boats.  Killer whales often hunt in packs, and will attack other whales many times their own size.

Their mouths and throats are big enough to swallow seals, penguins, and young walruses whole.  Only the tusked adult walrus holds the killer at bay.

When killer whales see a seal on a floating chunk of ice, they rush up under the ice and crash into it, knocking the victim into the water.  Killer whales also feed on fish and even sea birds.

Killer whales are found in all the oceans of the world, but prefer to live in the cold arctic and Antarctic waters. – Dick Rogers

How do barnacles get on a ship’s hull?

Barnacles on Ship Hull

Barnacles can swim at birth.  When they reach adult stage, they attach themselves to objects in the water and grow a shell.

If you have ever visited a seacoast where there were rocks and piers you have almost certainly seen barnacles, for the “crush” you saw on the wharf’s pilings and the rocks was made up of millions of salt water shellfish called barnacles.

When barnacle is first hatched, it resembles a young water flea and can swim about in the water.

But when it reaches adult stage it can no longer swim, so it attaches itself to any convenient object, such as the hull of a ship, piling, rock, whale, or even a sting of seaweed.

Once attached, a hard lime-like shell  forms around the barnacles.  The barnacle eats by waving its feathery legs through an opening in the shell to pull tiny sea creatures and plants into its mouth.

In olden days, sailor of wooden sailing ships had to periodically pull their ships ashore to scrape off the masses of barnacles clinging to the hulls, because they reduced the ship’s speed and made steering difficult.  Today, special paints, prevent growth of barnacles. – Dick Rogers

Which is the largest shark?

The largest known living shark is the whale shark which is often more than 50 feet long and weights several tons.  It is also the biggest of all fishes.

(The whale, which is larger and resembles a fish, is not a fish but a mammal.)

Shark

Whale sharks can easily be recognized by the lines of pale spots on a grayish body, as well as by their huge size.

Curiously enough, this biggest shark of all is completely harmless to man.  Though it has jaws wide enough to swallow a man, the whale shark lives peacefully in the warm sea, eating seaweed and small fish.

Sharks have the reputation for being among the most dangerous of sea creatures.

There are many kinds of sharks, and while some are quite fierce, the surprising thing is that most kinds of sharks are quite harmless.

The great white shark is sometimes called the most dangerous of sharks.  It may grow to be 35 feet long and will have no hesitation about making a meal of a swimmer. – Dick Rogers

What are jellyfish?

Jellyfish

Jellyfish are unusual sea animals that have jellylike bodies and stinging tentacles, with which they capture their food.  The jellyfish is among the strangest of sea creatures.

It is not even a fish, but a very simple kind of sea animal that has no skeleton.  The main pair of the jellyfish’s body looks like an umbrella, and it is made up of two thin layers of tissue with jellylike materials between them.

Around the rim of the umbrella are usually a number of simple eyes, and in the center of the body underneath is the mouth.

Hanging down from the edge are string like tentacles, armed with batteries of stinging cells filled with paralyzing poison.

If a small bumps into the jellyfish’s tentacles, it gets stung and captured for food. If you touch these tentacles, you may get stung, too!

A jellyfish swims by folding and unfolding its body—much like closing an umbrella.  Mostly, it floats along with the current.  Some jellyfish are no larger than a pea.  Other may be two feet or more in diameter. – Dick Rogers