Modifiers matching ratite:

• large,
• flightless,
• modern,
• extinct,

Simple categories matching extinct:

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