'Untamed Americas': 24 of America’s Wildest Creatures
Click through this slideshow to explore the wildlife of our mountains, coasts, deserts, and forests. The two-night "Untamed Americas" miniseries event starts Sunday, 6/10 at 9 PM and concludes Monday, 6/11 at 9 PM on the National Geographic Channel.
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American Beaver (Castor canadensis)
Boreal Forest, Canada
Beaver teeth never stop growing, so they must constantly gnaw on trees (like birch, maple and black alder) to file them down.