Modifiers matching survivor:

• prehistoric,
• vulnerable,
• rare,
• adaptive,

Simple categories matching prehistoric:

• item,
• artefact,
• mammal,
• monument,
• animal,
• material,
• creature,
• beast,
• organism,
• survivor,
• reptile,
• relic,
• tool,
• site,
• critter,
• artifact,
• dinosaur,
• giant,