Besides overlapping keratinous scales, what structural characteristic defines the Order Squamata?
Answer
A highly kinetic skull structure
The Order Squamata encompasses all lizards and snakes, representing the largest order of reptiles. While the presence of overlapping keratinous scales that are shed periodically is a universal trait for this order, the defining internal feature is a highly kinetic skull structure. This kineticism allows for significant flexibility and gape expansion in many members of Squamata, enabling them to swallow prey larger than their heads, although this structure is significantly more rigid and specialized in burrowing species like *Rena humilis* adapted for tunneling.
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