Modifiers matching equid:

• wild,
• large,
• extinct,

Simple categories matching extinct:

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