Modifiers matching survivor:

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

Simple categories matching prehistoric:

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