9. Moa (Dinornithiformes)
The towering moa of New Zealand were among the largest birds ever to walk the earth, with some species reaching up to 12 feet in height. These flightless giants were swiftly hunted into extinction after the arrival of Maori settlers. By the 15th century, all moa had vanished, leaving a lasting impact on New Zealand’s unique ecosystems and food webs. Their story serves as a striking example of how quickly human activity can alter entire landscapes.
