Question

insert two dashes where needed. new dna evidence suggests that the kiwi a small, flightless bird found in new zealand is closely related to the enormous, extinct elephant bird.

Explanation:

The phrase "a small, flightless bird found in New Zealand" is non - essential information about "the kiwi" and can be set off with dashes.

Answer:

New DNA evidence suggests that the kiwi - a small, flightless bird found in New Zealand - is closely related to the enormous, extinct elephant bird.