Assertion: krill | /r/CapableOf | use muscle
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text: In the picture to the right a 1micrometer sized object is seen on a krill filter.these are used extensively during the winter months by krill to scrape phytoplankton off theof sea ice where there is still enough light penetrating to allow food to grow.are found on several regions on a krill's body, they have a reflector at the back, a lens at the front and can be directed using muscles, the function is not fully known, it may be connected with schooling or matingFor this reason krill are sometimes called "light shrimp"one of the best visual structures in nature, though why this should be so in krill is a mystery.as a defence against predators, such swarms can have up to 10,000 to 30,000 individuals per cubic meter of sea water.