Answer:
Ostrich
Step-by-step explanation:
RHEA look most like a OSTRICH although RHEA is smaller in nature while OSTRICH is larger in nature but they both have legs that are long , their neck is as well long and they both have have a round body that is covered or protected with feathers although RHEA head and neck are covered and protected with feathers unlike OSTRICH which head and neck has lesser feathers and lastly both RHEA and OSTRICH cannot fly.
Therefore RHEA look most like or similar to OSTRICH