Final answer:
The Australian bird that can run but not fly at nearly 30 mph is the Emu. It's adapted for running and belongs to a group of flightless birds including the ostrich and kiwi.
Step-by-step explanation:
The Australian bird that can run nearly 30 mph but cannot fly is the Emu. The Emu is a large, flightless bird, similar to the ostrich found in Africa, and is well-adapted for running at high speeds across the landscape. It is one of several flightless birds which include the ostrich, kiwi, rhea, cassowary, and moa. While penguins are also flightless, they are adapted for swimming rather than running.