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National Park ServiceVolcanic tuff near Castolon
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The Big Bend Mosquitofish  

Did You Know?
The Big Bend Mosquitofish (Gambusia Gaigei) has the smallest known home range of any vertebrate species. It is found in the wild only in a few small spring pools in the area of Rio Grande Village.

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Last Updated: July 25, 2006 at 00:23 EST