Modifiers matching equid:

• large,
• wild,
• extinct,

Simple categories matching extinct:

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