Modifiers matching ratite:

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

Simple categories matching extinct:

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