The article says: "Of greater surprise is the estimated length of time that this small group survived. If this is correct, then one imagines that it would requi

The article says: "Of greater surprise is the estimated length of time that this small group survived. If this is correct, then one imagines that it would require a stable environment with sufficient resources and few stresses to the system." Maybe they were kept in a nature preserve run by friendly aliens, until the climate got sorted out ?