What characteristic of the *Rena humilis* head contributes to its rudimentary profile?

Answer

It is not distinctly separated from the neck

The overall structure of the head of the Western Blind Snake reflects its specialized, hidden existence rather than the active predatory style of surface-dwelling snakes. Compared to many other snake species, the head structure is considered rudimentary. This is largely due to the lack of a clear demarcation point; the head transitions smoothly into the neck region without a sharp angle or distinct separation. This uniform profile from the snout back through the body contributes to its overall neat, thread-like appearance.

What characteristic of the *Rena humilis* head contributes to its rudimentary profile?
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