Any member of the family Amphisbaenidae, which includes the worm-lizards and two-headed lizards.
From 'Amphisbaena' + the suffix '-id' meaning 'member of a group', used in taxonomic classification.
Amphisbaenids are burrowing specialists that have evolved to be so perfectly adapted to underground life that they've lost most of their eyesight and developed bony skulls that can withstand pressure from soil.
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