How big do zebra mussels get? <!-- biology, wildlife, invasive species -->
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Question: How big do zebra mussels get?

Answer:

Generally, zebra mussels are small, averaging about an inch long. Two inches is approximately the maximum size. Their life span is four to five years.

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

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