error import maya to unity (Not complete)

How can I import this model from maya to unity. It’s OK with many other models but with this, something is strange!

Just take a look!

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Those are the pictures which I import from maya to unity

You can see clearly the 3rd picture (where are the wings of the bat ?)

You also can see clearly the last picture (where are the tail of the bat ?)

Thanks for any helps

Best regards :slight_smile:

Polygons in Unity, unlike in Maya, are subject to backface culling. If you have polygons that represent thin surfaces rather than the boundaries of solid objects, duplicate those polygons and reverse the normals on the copies.