Mountain Beaver Skull - Mountain beavers, not a true beaver, are heavy bodied rodents with short limbs. They are considered the most primitive living rodent. The skull reflects these primitive traits in that it is flattened over all and the auditory bullae, or ear bones, are flask shaped. This unusual skull allow a view into the distant past of rodents as well as mammals in general.
Origin: North America
Average Skull Length: 7 cm (2.8 in)
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Mountain Beaver (Aplodontia rufa)