NationalGeographic.com reported –
There are about 8,500 species of sponges, a type of simple, mostly stationary invertebrate, and the vast majority passively filter their food on the seafloor. But in the past two decades, scientists have found 7 species of carnivorous sponges that attack prey—and the new discoveries bump that number to 11, said Lonny Lundsten, a biologist at the Monterey Bay Aquarium Research Institute.
DUMMR.com 
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