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How does the pink fairy armadillo block the entrance to its burrow?

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Nine-banded armadillo (Dasypus novemcinctus). — armadillo Nine-banded armadillo (*Dasypus novemcinctus*).

The pink fairy armadillo (Chlamyphorus truncatus) blocks the entrance to its burrow by using the rear of its carapace as a flat plate. Because the animal is truncated, the back of its shell is vertical, allowing it to effectively plug the burrow opening when it retreats inside.1