A Modern Iteration
Even though sketches of these animals bear a physical resemblance to tortoises, glyptodons actually had more similarities with armadillos.
Both of them are land-dwelling mammals with long snouts as well as bony coverings atop their heads.
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From Prehistoric Times
They originated from South America, although they eventually made their way to Guatemala.
It was most likely that the one they found in Argentina died or got stuck in riverbank after getting covered by wreckage from a storm.