Science Museum of Minnesota Giant Beaver Skull ReplicaCelebrate Minnesotas state fossil with this museum quality replica of a juvenile Giant Beaver, Castoroides ohioensis, skull and lower jaw. The original fossil was discovered in Saint Paul, Minnesota, in 1938 by WPA workers during construction near the Mississippi River. This juvenile specimen lived approximately 11,700 years ago at the end of the last Ice Age, alongside mammoths, scimitar toothed cats, and the first humans in the region. Known as apa