Moddel webbed wings invisble

So basically I downloaded this wonderful dragon model and animation (as seen below) but the problem is that once i import the model onto unity, one one side of the dragons wings will appear. For example, if you take out the model and make the camra face under the model, everything but the webbed wings will appear. If you face the camra above the mobel, you can see the whole model and it’s webbed wings. Anyone know what’s going on here?

http://tf3dm.com/3d-model/big-dragon-40-animations-20634.html

Simplest solution is to just edit the shader assigned to the material used by the wings and change CULL BACK to CULL OFF. However, this might (depending on what sort of shader it is) do some slightly funky things with normal maps and shadows. If that doesn’t work, you’ll have to edit the model in a 3d software (i.e. Blender) and correctly add a back face to the wings.