Modifiers matching human:

• ancient,
• extinct,
• modern,
• primitive,
• fossil,
• carnivorous,

Simple categories matching extinct:

• bird,
• equid,
• predator,
• mammal,
• animal,
• beast,
• organism,
• plant,
• creature,
• fauna,
• dinosaur,
• reptile,
• amniote,
• giant,
• relative,
• herbivore,
• ratite,
• human,
• vertebrate,
• archosaur,