Modifiers matching equid:

• large,
• wild,
• extinct,

Simple categories matching extinct:

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