Thursday, 6 November 2014

Day 4- Sea Stars and Urchins

Sea stars and urchins from LEARNZ on Vimeo.
Where does the Antarctic cushion star live? Where do these Antarctic cushion stars fit into the food web? What do these urchins use their spines for?

Molly: The cushion star fish are full of water.

Hunter: The Antarctic cushion stars are the size of a hand

Milly: They live between 80- 100 years.

Wilbur: When it is hotter, they breathe more.

George: The sea urchins have skeletons on the outside of their bodies.

Josie:  Larger crabs and bigger sea stars eat the cushion star fish.

Anna: Sea stars feel squishy because they are full of water.


Sea Stars and Urchins

Sea Stars

Sea stars are called the Antarctic cushion stars, they feel squishy and are full of water.
Cushion stars are the size of a hand, they live in the dark. They live as long as 80-100 years, they are scavengers, they eat other things.
A large crab eats them, and bigger sea stars too.

They are fatter and bigger than star cushions, they search around in the dark for food, they eat plankton.
When they are hot, they breathe faster, if they breathe faster everyday they can’t cope and get stressed.
They have their skeleton on the outside.

Sea Urchins: The Wet Lab

If they're stressed out they breathe faster. The water in the experiment is the same as the temperature in the southern ocean. They will test 50 different star cushions so that it is a fair test.

By Anna


  • Their bodies are full of water
  • The Antarctic cushion star is the size of a palm
  • They are fragile
  • Sea stars live to 80 to 100 years
  • They are scavengers
  • Urchins have their skeletons on the outside of their body
  • Smaller animals use less oxygen
  • When starfish get too hot they start to breathe faster

By George

Science in the wet lab from LEARNZ on Vimeo.

The fair test: science in action from LEARNZ on Vimeo.
What is a control? Why has Kate collected Antarctic cushion stars from more than one place? How many sea stars is Kate sending back to New Zealand?

Antarctic Cushion Stars
  • They are pink
  • They live in bottom of the sea
  • They are squishy on top
  • They are the same size as a hand
  • They live in the dark and up to 80-100 years
  • When they get to the size of a palm they don't grow anymore
  • They eat dead things
  • Their bodies are full of water
By Milly

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