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The "Summer" Mule Deer diorama is in the "Edge of the Wild" Exhibition the 2nd Floor.  There's a butterfly in this exhibit which moves its wings every 12 seconds.  This butterfly is one of only two moving objects in all of the museum's dioramas.

The "Summer" Mule Deer diorama. Un-zoomed, looking at the left window of diorama.  The butterfly is on a small stump behind the center dividing post and behind the aspen tree.

The butterfly as seen from the left window,  behind the center dividing post and behind the aspen tree.

"Wings Down!" & "Wings Up!"