What are zebra mussels? <!-- biology, wildlife, invasive species -->
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Question: What are zebra mussels?

Answer:

Zebra mussels are a type of mollusk, which also include a wide variety of organisms such as squids, octopuses, snails, oysters, scallops, and clams.

Zebra Mussel

Source of this FAQ:
http://cars.er.usgs.gov/Nonindigenous_Species/Zebra_mussel_FAQs/zebra_mussel_faqs.html

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