Sea urchins have several adaptations to help them survive. To protect themselves from predators, sea urchins will react immediately if something sharp touches their shell and they will point all of their spines towards the area being poked. They are also light-sensitive. This is why they are nocturnal. This light sensitivity also allows sea urchins to move their spines in reaction to shadows. In order to protect themselves from being swept away from the powerful ocean currents and waves, sea urchins lodge themselves into holes or crevasses. Finally sea urchins, somewhat like starfish, have a certain regenerative ability. If a spine is damaged or lost, a sea urchin can rebuild it. However if there is too much extensive damage to the test, the sea urchin won't be able to heal it.
There are many different types of sea urchins. Some types are black with long spikes, and others are red, white, or yellow.
Sea urchins are sometimes called sea hedge hogs. Sea urchin's scientific name is Echinoderm. They are found across many ocean floors throughout the world.
Typically spherical in shape - covered in sharp spines for protection. Look in Wikipedia - there's lots of photographs available.
it has no brain.
the sea urchin has many adaptions like its spikes to protect it self from predators.
Urchin (sea urchin) umbrella-fish
The classification of a Sea Urchin is Echinoidea
sea urchin
Sea otters for one.
No, a sea urchin and a sea anemone are two different sea creatures nothingalike.They do have some alike characteristics.like they both use their long tentacles , or spikes for protection.
A sea urchin does move, but not very frequently.
Answer It [a sea urchin's sting] IS poisonous. If a sea urchin stings you, you might have [or do] the following: 1) Muscle spasms. 2) Difficulties in breathing. 3) Death 4) Faint So, you better watch out for sea urchins.
because the crab needs the sea urchin for protection and the sea urchin needs the crab for food
aristotle's lantern
Ummm...it's the thing from which a sea urchin hatches?
I think a sea anenome and a sea urchin can live together because i have a little aquarium and there is a sea urchin and and a sea anenome (if that's how you spell it) living in there and they were perfectly fine. BUT if you have a sea urchin do not have any crabs in there, because my sea urchin killed one, and almost killed another one by taking its claw off. :(